More better layout ch10a,b,11

17 files changed, 296 insertions, 950 deletions

diff --git a/chapter11/README.md b/chapter11/README.md
index 58adbbfb..cd44f811 100644
--- a/chapter11/README.md
+++ b/chapter11/README.md
@@ -3,20 +3,11 @@
 [Previous: Chapter 10b](../chapter10b/README.md) |
 [Next: Chapter 12](../chapter12/README.md)
 
-This chapter schedules the memory representation introduced in
-[10b](../chapter10b/README.md): one parser-visible `$mem`, with `MemMerge`,
-`MemPhi`, and `BulkMemPhi` recovering independent field chains. Start supplies
-`{ctrl, $mem, arg}`. Return consumes `{ctrl, $mem, result}`, with the complete
-memory aggregate in slot 1. Nodes consuming or producing both control and
-memory consistently use slot 0 for control and slot 1 for memory.
-
-The new scheduling rule is to distinguish a memory aggregate from a memory
-write. `MemMerge` gets a placement from its inputs and uses, but emits no heap
-operation and creates no load/store anti-dependency. A Store or MemPhi can
-constrain a Load only for the same alias; a BulkMemPhi can constrain it only
-while it still covers that alias. Both kinds of memory Phi remain attached to
-their Region, just like scalar Phis.
+This chapter schedules the programs from [10b](../chapter10b/README.md),
+picking a slot#0 CFG input for all nodes lacking one.
 
+Also in this chapter, we'll be presenting several fairly detailed graph
+algorithms.  You might want to brush up on your graph theory!
 
 # Table of Contents
 
@@ -36,9 +27,11 @@ their Region, just like scalar Phis.
 You can also read [this chapter](https://github.com/SeaOfNodes/Simple/tree/linear-chapter11) in a linear Git revision history on the [linear](https://github.com/SeaOfNodes/Simple/tree/linear) branch and [compare](https://github.com/SeaOfNodes/Simple/compare/linear-chapter10b...linear-chapter11) it to the previous chapter.
 
 
-The original input source program defines a sequence in which things happen. As we parse the program into Sea of Nodes representation
-and perform various optimizations, this sequence is not fully maintained. The optimized Sea of Nodes graph is driven more
-by dependencies between nodes rather than the sequence of instructions in the original source program.
+The original input source program defines a sequence in which things happen. As
+we parse the program into Sea of Nodes representation and perform various
+optimizations, this sequence is not fully maintained. The optimized Sea of
+Nodes graph is driven by the dependencies between nodes rather than the
+sequence of instructions in the original source program.
 
 Our goal in this chapter is to look at how we can recover a schedule for executing instructions from an
 optimized Sea of Nodes graph. This schedule needs to preserve the semantics of the original source program,
@@ -91,26 +84,35 @@ First let's look at the graph before scheduling.
 
 These walkthrough diagrams show the precise `S.f` chain and the final
 MemMerge consumed by Return. The unchanged default memory comes from Start;
-any redundant bulk Phis have folded away. Arrows point from uses to definitions.
+any redundant bulk Phis have folded away. As in 10a and 10b, the diagrams omit
+control-flow context, including Regions and their Phi bindings. Small,
+detached True/False projections remain where they gate a Load or Store.
+Unlike Chapter 10's schematic source gates, these figures show the actual
+scheduling inputs at each stage. Entry-block and Loop bindings are omitted.
 
 ![Graph1](./docs/graph1.svg)
 
 Observe that
 
-* Control nodes are colored in yellow; these are immovable.
-* New nodes have control input and therefore these are already scheduled.
-* Ditto for Phi nodes which are attached to the Region nodes.
-* So what remains are the "floating" Data nodes that do not have a control input at this stage. In this example, these are the load `.f` and store `.f=` nodes.
+* Control nodes are immovable. Most are omitted here.
+* New nodes already have control inputs, and Phis are bound to Regions;
+  these bindings remain fixed even though they are not drawn.
+* The load `.f` and store `.f=` nodes are still "floating": they have no
+  control input at this stage, so scheduling must choose their blocks.
 
 Now, let's look at the graph after we run the early schedule.
 
 ![Graph2](./docs/graph2.svg)
 
 
-* Observe that the load `.f` and the stores `.f=` now have control edges to the `$ctrl` projection from Start. Thus, the early schedule has put the Data nodes in the first basic block.
-* This is because the inputs to these nodes have the `$ctrl` projection as the immediate dominator.
+The early schedule puts the load `.f` and stores `.f=` in the first basic
+block, since their inputs are available there. These entry-block control
+bindings are omitted, so the memory view looks unchanged.
 
-The graph below shows the schedule post late scheduling.
+The graph below focuses on memory and data dependencies after late scheduling.
+The control-flow scaffold, including the Region, is omitted. Store #22's
+control input remains visible as the red edge to the standalone True
+projection #8; the Store-to-Load anti-dependency and memory Phis are retained.
 
 ![Graph3](./docs/graph3.svg)
 
@@ -146,8 +148,9 @@ Following early schedule generation, we get:
 
 ![Graph5](./docs/graph5.svg)
 
-Note that the `arg == 5` comparison at this stage is not in the correct place.
-This is rectified after we complete late scheduling.
+The early schedule places Store #31 at the loop header (its control binding
+is omitted). Late scheduling moves it to the True branch #15 of
+`if (arg == 5)`, shown by the red control edge:
 
 ![Graph6](./docs/graph6.svg)
 
@@ -214,32 +217,11 @@ Now, look at the modified graph after we insert an edge from the infinite loop t
 
 ![Graph8](./docs/graph8.svg)
 
-The implementation is in the Loop node:
-
-```java
-    // If this is an unreachable loop, it may not have an exit.  If it does not
-    // (i.e., infinite loop), force an exit to make it reachable.
-    public void forceExit( StopNode stop ) {
-        // Walk the backedge, then immediate dominator tree until we hit this
-        // Loop again.  If we ever hit a CProj from an If (as opposed to
-        // directly on the If) we found our exit.
-        CFGNode x = back();
-        while( x != this ) {
-            if( x instanceof CProjNode exit )
-                return;         // Found an exit, not an infinite loop
-            x = x.idom();
-        }
-        // Found a no-exit loop.  Insert an exit
-        NeverNode iff = new NeverNode(back());
-        for( Node use : _outputs )
-            if( use instanceof PhiNode phi )
-                iff.addDef(use);
-        CProjNode t = new CProjNode(iff,0,"True" );
-        CProjNode f = new CProjNode(iff,1,"False");
-        setDef(2,f);
-        stop.addDef(new ReturnNode(t,Parser.ZERO,null));
-    }
-```
+The implementation is in
+[`LoopNode.forceExit()`](src/main/java/com/seaofnodes/simple/node/LoopNode.java#L57).
+It walks the backedge's dominator chain to look for an exit. If none exists,
+it inserts a Never node and a never-taken return path, making the loop
+reachable to the scheduler's backward walk.
 
 ## Dominators
 
@@ -247,87 +229,28 @@ In Simple, we compute Dominators incrementally. Our approach relies on the fact
 but we never introduce new control structure via peepholes. This allows us to use a simple approach described below.
 
 The CFG node is the base class for all control nodes. It maintains a conservative approximation of dominator depth via `_idepth`. This field is a cached value representing
-the immediate dominator depth. Its initial value is `0`, which signifies that it has not yet been computed. On request, we compute this as shown below.
+the immediate dominator depth. Its initial value is `0`, which signifies that it has not yet been computed. The depth is computed on request.
+
+See [`CFGNode.idepth()`](src/main/java/com/seaofnodes/simple/node/CFGNode.java#L51)
+for the default computation and cache. The overrides in
+[`RegionNode`](src/main/java/com/seaofnodes/simple/node/RegionNode.java#L94),
+[`LoopNode`](src/main/java/com/seaofnodes/simple/node/LoopNode.java#L31),
+[`StartNode`](src/main/java/com/seaofnodes/simple/node/StartNode.java#L36), and
+[`StopNode`](src/main/java/com/seaofnodes/simple/node/StopNode.java#L57)
+handle merges, loop entries, and the graph's endpoints.
 
-```java
-class CFGNode {
-  public int _idepth;
-  public int idepth() { return _idepth==0 ? (_idepth=idom().idepth()+1) : _idepth; }
-}
-class RegionNode extends CFGNode {
-  // Immediate dominator of Region is a little more complicated.
-  @Override public int idepth() {
-    if( _idepth!=0 ) return _idepth;
-    int d=0;
-    for( Node n : _inputs )
-      if( n!=null )
-        d = Math.max(d,((CFGNode)n).idepth()+1);
-    return _idepth=d;
-  }
-}
-class LoopNode extends RegionNode {
-  // Bypass Region idom, same as the default idom() using use in(1) instead of in(0)
-  @Override public int idepth() { return _idepth==0 ? (_idepth=idom().idepth()+1) : _idepth; }
-}
-class StartNode extends CFGNode {
-  @Override public int idepth() { return 0; }
-}
-class StopNode extends CFGNode {
-  @Override public int idepth() {
-    if( _idepth!=0 ) return _idepth;
-    int d=0;
-    for( Node n : _inputs )
-      if( n!=null )
-        d = Math.max(d,((CFGNode)n).idepth()+1);
-    return _idepth=d;
-  }
-}
-```
 If portions of the control flow graph are deleted, then there will be gaps in the `_idepth`, but it still correctly reflects the
 invariant that the value of `_idepth` increases as we go down the dominator tree.
 
 Alongside the dominator depth, which is cached on first compute, a method is provided to get the immediate Dominator node. This
 value is not cached as it is only valid at a point in time, and is invalidated as the graph changes.
 
-We show the code that computes this value:
-
-```java
-class CFGNode {
-  // Return the immediate dominator of this Node and compute dom tree depth.
-  public CFGNode idom() { return cfg(0); }
-  // Return the LCA of two idoms
-  public CFGNode idom(CFGNode rhs) {
-    if( rhs==null ) return this;
-    CFGNode lhs = this;
-    while( lhs != rhs ) {
-      var comp = lhs.idepth() - rhs.idepth();
-      if( comp >= 0 ) lhs = lhs.idom();
-      if( comp <= 0 ) rhs = rhs.idom();
-    }
-    return lhs;
-  }
-}
-class RegionNode extends CFGNode {
-  @Override public CFGNode idom() {
-    CFGNode lca = null;
-    // Walk the LHS & RHS idom trees in parallel until they match, or either fails.
-    // Because this does not cache, it can be linear in the size of the program.
-    for( int i=1; i<nIns(); i++ )
-      lca = cfg(i).idom(lca);
-    return lca;
-  }
-}
-class LoopNode extends RegionNode {
-  // Bypass Region idom, same as the default idom() using use in(1) instead of in(0)
-  @Override public CFGNode idom() { return entry(); }
-}
-class StartNode extends CFGNode {
-  @Override public CFGNode idom() { return null; }
-}
-class StopNode extends CFGNode {
-  @Override public CFGNode idom() { return null; }
-}
-```
+[`CFGNode.idom()` and `domLCA()`](src/main/java/com/seaofnodes/simple/node/CFGNode.java#L60)
+provide the default immediate dominator and the walk that finds the least
+common ancestor of two dominators.
+[`RegionNode.idom()`](src/main/java/com/seaofnodes/simple/node/RegionNode.java#L103)
+combines the incoming paths; [`LoopNode.idom()`](src/main/java/com/seaofnodes/simple/node/LoopNode.java#L33)
+uses the loop entry. Start and Stop have no immediate dominator.
 
 ## Loop Depth
 
@@ -336,105 +259,30 @@ it is not necessary to implement a generic loop discovery process.
 
 We do however need to compute a loop depth. This is done similarly to how we compute the dominator depth.
 
-```java
-class CFGNode {
-  // Loop nesting depth
-  public int _loopDepth;
-  public int loopDepth() { return _loopDepth==0 ? (_loopDepth = cfg(0).loopDepth()) : _loopDepth; }
-}
-class RegionNode extends CFGNode {
-  @Override public int loopDepth() { return _loopDepth==0 ? (_loopDepth = cfg(1).loopDepth()) : _loopDepth; }
-}
-class LoopNode extends RegionNode {
-  @Override public int loopDepth() {
-    if( _loopDepth!=0 ) return _loopDepth; // Was already set
-    _loopDepth = entry()._loopDepth+1;     // Entry depth plus one
-    // One-time tag loop exits
-    for( CFGNode idom = back(); idom!=this; idom = idom.idom() ) {
-      // Walk idom in loop, setting depth
-      idom._loopDepth = _loopDepth;
-      // Loop exit hits the CProj before the If, instead of jumping from
-      // Region directly to If.
-      if( idom instanceof CProjNode proj ) {
-        assert proj.in(0) instanceof IfNode; // Loop exit test
-        // Find the loop exit CProj, and set loop_depth
-        for( Node use : proj.in(0)._outputs )
-          if( use instanceof CProjNode proj2 && proj2 != idom )
-            proj2._loopDepth = _loopDepth-1;
-      }
-    }
-    return _loopDepth;
-  }
-}
-class StartNode extends CFGNode {
-  @Override public int loopDepth() { return (_loopDepth=1); }
-}
-class StopNode extends CFGNode {
-  @Override public int loopDepth() { return (_loopDepth=1); }
-}
-```
+[`CFGNode.loopDepth()`](src/main/java/com/seaofnodes/simple/node/CFGNode.java#L77)
+inherits depth from its control input, while
+[`RegionNode.loopDepth()`](src/main/java/com/seaofnodes/simple/node/RegionNode.java#L116)
+uses an incoming path.
+[`LoopNode.loopDepth()`](src/main/java/com/seaofnodes/simple/node/LoopNode.java#L35)
+adds a nesting level and walks the backedge's dominator chain to mark loop exits.
+[`StartNode`](src/main/java/com/seaofnodes/simple/node/StartNode.java#L41) and
+[`StopNode`](src/main/java/com/seaofnodes/simple/node/StopNode.java#L67)
+establish the outermost depth of 1.
 
 ## Early Schedule
 
 The GCM algorithm proper starts with the computation of the early schedule, during which we do an upward DFS walk on the "inputs" of each Node, starting from the bottom (Stop). We schedule each data node to the
 first control block where they are dominated by their inputs.
 
-A pre-condition of this is to ensure that infinite loops have been "fixed" as described earlier.
+A pre-condition of this is to ensure that infinite loops have been fixed as described earlier.
 
-The implementation of early schedule is shown below:
-
-```java
-    private static void schedEarly() {
-        ArrayList<CFGNode> rpo = new ArrayList<>();
-        BitSet visit = new BitSet();
-        _rpo_cfg(Parser.START, visit, rpo);
-        // Reverse Post-Order on CFG
-        for( int j=rpo.size()-1; j>=0; j-- ) {
-            CFGNode cfg = rpo.get(j);
-            cfg.loopDepth();
-            for( Node n : cfg._inputs )
-                _schedEarly(n,visit);
-            // In dead infinite loops, entire code blocks may be unreachable
-            // from below.  Reach down from the CFG to their Phis so their
-            // inputs are scheduled too.
-            if( cfg instanceof RegionNode ) {
-                int len = cfg.nOuts();
-                for( int i=0; i<len; i++ )
-                    if( cfg.out(i) instanceof PhiNode phi )
-                        _schedEarly(phi,visit);
-            }
-        }
-    }
-
-    // Post-Order of CFG
-    private static void _rpo_cfg(Node n, BitSet visit, ArrayList<CFGNode> rpo) {
-        if( !(n instanceof CFGNode cfg) || visit.get(cfg._nid) )
-            return;             // Been there, done that
-        visit.set(cfg._nid);
-        for( Node use : cfg._outputs )
-            _rpo_cfg(use,visit,rpo);
-        rpo.add(cfg);
-    }
-
-    private static void _schedEarly(Node n, BitSet visit) {
-        if( n==null || visit.get(n._nid) ) return; // Been there, done that
-        visit.set(n._nid);
-        // Schedule inputs first, except Phis: following their backedges would
-        // enter a data cycle before its control has been scheduled.
-        for( Node def : n._inputs )
-            if( def!=null && !(def instanceof PhiNode) )
-                _schedEarly(def,visit);
-        // An existing edge 0 already supplies control (or a Phi/Proj binding).
-        if( n.in(0)==null ) {
-            // Schedule at deepest input
-            CFGNode early = Parser.START; // Maximally early, lowest idepth
-            for( int i=1; i<n.nIns(); i++ )
-                if( n.in(i)!=null && n.in(i).cfg0().idepth() > early.idepth() )
-                    early = n.in(i).cfg0(); // Latest/deepest input
-            n.setDef(0,early);              // First place this can go
-        }
-    }
-```
+The implementation starts in
+[`GlobalCodeMotion.schedEarly()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L59).
+[`_rpo_cfg()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L82)
+builds the CFG traversal order, and
+[`_schedEarly()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L91)
+recursively schedules data inputs. It skips recursion through Phi inputs to
+avoid entering a data cycle before its control has been scheduled.
 
 Existing control and Phi/Proj bindings are preserved. Floating nodes receive
 the deepest input block as their earliest placement. MemMerge follows this
@@ -449,121 +297,28 @@ waits for memory users that can overwrite or merge its alias. The chosen block
 lies between the early placement and the common dominator of all uses, favoring
 shallower loops and then deeper control flow.
 
-```java
-    private static void schedLate( StopNode stop) {
-        CFGNode[] late = new CFGNode[Node.UID()];
-        Node[] ns = new Node[Node.UID()];
-        // Record Load NIDs at all their CFG block choices, then check against
-        // Store block choices to force a Load above an anti-dependent Store.
-        int[] anti = new int[Node.UID()];
-        // Breadth-first scheduling
-        breadth(stop,ns,late,anti);
-
-        // Copy the best placement choice into the control slot
-        for( int i=0; i<late.length; i++ )
-            if( ns[i] != null && !(ns[i] instanceof ProjNode) )
-                ns[i].setDef(0,late[i]);
-    }
-
-    private static void breadth(Node stop, Node[] ns, CFGNode[] late, int[] anti) {
-        // Things on the worklist have some (but perhaps not all) uses done.
-        WorkList<Node> work = new WorkList<>();
-        work.push(stop);
-        Node n;
-        outer:
-        while( (n = work.pop()) != null ) {
-            assert late[n._nid]==null; // No double visit
-            // These I know the late schedule of, and need to set early for loops
-            if( n instanceof CFGNode cfg ) late[n._nid] = cfg.blockHead() ? cfg : cfg.cfg(0);
-            else if( n instanceof PhiNode phi ) late[n._nid] = phi.region();
-            // These nodes have a fixed late placement at their original control.
-            else if( n instanceof ProjNode || n instanceof NewNode || n==Parser.ZERO ) late[n._nid] = n.cfg0();
-            else {
-
-                // All uses done?
-                for( Node use : n._outputs )
-                    if( use!=null && late[use._nid]==null )
-                        continue outer; // Nope, await all uses done
-
-                // Loads need their memory inputs' uses also done
-                if( n instanceof LoadNode ld )
-                    for( Node memuse : ld.mem()._outputs )
-                        if( antiUse(ld,memuse) && late[memuse._nid]==null )
-                            continue outer;
-
-                // All uses done, schedule
-                _doSchedLate(n,ns,late,anti);
-            }
-
-            // A use just finished; reconsider its inputs and waiting loads,
-            // even when the shared memory input was already scheduled.
-            for( Node def : n._inputs ) {
-                if( def==null ) continue;
-                if( late[def._nid]==null ) work.push(def);
-                for( Node out : def._outputs )
-                    if( out instanceof LoadNode ld && late[ld._nid]==null )
-                        work.push(ld);
-            }
-            if( n instanceof LoopNode loop )
-                for( Node phi : loop._outputs )
-                    if( phi instanceof PhiNode && late[phi._nid]==null )
-                        work.push(phi);
-        }
-    }
-
-    private static void _doSchedLate(Node n, Node[] ns, CFGNode[] late, int[] anti) {
-        // Walk uses, gathering the LCA (Least Common Ancestor) of uses
-        CFGNode early = n.in(0) instanceof CFGNode cfg ? cfg : n.in(0).cfg0();
-        assert early != null;
-        CFGNode lca = null;
-        for( Node use : n._outputs )
-            if( use != null )
-              lca = use_block(n,use, late).domLCA(lca);
-
-        // Loads may need anti-dependencies, raising their LCA
-        if( n instanceof LoadNode load )
-            lca = find_anti_dep(lca,load,early,late,anti);
-
-        // Walk up from the LCA to the early, looking for best place.  This is
-        // the lowest execution frequency, approximated by least loop depth and
-        // deepest control flow.
-        CFGNode best = lca;
-        lca = lca.idom();       // Already found best for starting LCA
-        for( ; lca != early.idom(); lca = lca.idom() )
-            if( better(lca,best) )
-                best = lca;
-        assert !(best instanceof IfNode);
-        ns  [n._nid] = n;
-        late[n._nid] = best;
-    }
-
-    // Block of use.  Normally from late[] schedule, except for Phis, which go
-    // to the matching Region input.
-    private static CFGNode use_block(Node n, Node use, CFGNode[] late) {
-        if( !(use instanceof PhiNode phi) )
-            return late[use._nid];
-        CFGNode found=null;
-        for( int i=1; i<phi.nIns(); i++ )
-            if( phi.in(i)==n )
-                found = phi.region().cfg(i).domLCA(found); // Can be more than one matching input.
-        assert found!=null;
-        return found;
-    }
-
-
-    // Least loop depth first, then largest idepth
-    private static boolean better( CFGNode lca, CFGNode best ) {
-        return lca.loopDepth() < best.loopDepth() ||
-            lca instanceof NeverNode ||
-            lca.idepth() > best.idepth() ||
-            best instanceof IfNode;
-    }
-```
+The implementation is divided into these steps:
+
+* [`schedLate()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L111)
+  manages the placement tables and installs the final control inputs;
+  [`breadth()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L126)
+  drives the worklist and wakes definitions and waiting loads as uses finish.
+* [`_doSchedLate()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L172)
+  finds the common dominator of uses, accounts for load anti-dependencies, and
+  walks toward the early placement. It calls
+  [`better()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L213)
+  to compare candidate blocks.
+* [`use_block()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L200)
+  handles Phi uses at their matching incoming control paths, rather than at
+  the merge itself.
 
 ## Inserting Anti Dependencies
 
-To ensure that Loads and Stores to the same memory location are correctly ordered, we insert an edge from the Store to the Load as described below: the Store must wait for the earlier Load.
-We call these edges anti-dependencies because they do not represent the Def-Use dependency that we normally capture in SoN, and are purely present as scheduling constraints.
+To ensure that Loads and Stores to the same memory location are correctly
+ordered, we insert an edge from the Store to the Load as described below: the
+Store must wait for the earlier Load.  We call these edges anti-dependencies
+because they do not represent the Def-Use dependency that we normally capture
+in SoN, and are purely present as scheduling constraints.
 
 We compute anti-dependencies DURING running schedule late. This is because we rely on the early-schedule, and the late-schedule of the Load's uses (before scheduling the Load).
 
@@ -581,66 +336,24 @@ is ready to schedule and when computing its anti-dependencies. A completed
 memory user wakes waiting loads even if their shared memory definition has
 already been scheduled.
 
-Since we're in the middle of "schedule late", we have already computed all the late schedules of a Load's users, and we have the Loads "Least Common Ancestor" of uses, the LCA or late position.
-We inspect the set of mem-defs that might impact the Load, and either add an anti-dependency from Store to Load, or raise the Loads effective LCA.
-For Phi mem-defs, we look at the Phi inputs and place an effective use on that block; this will be used to raise the Load's LCA.
-For stores, we do the same - until/unless we find stores with the SAME block as the Load's LCA. Then we add the anti-dependency edge to force ordering within the same block.
-
-The implementation is shown below.
-
-```java
-    // Only a store or memory Phi covering this alias can constrain a load.
-    // MemMerge packages slices without overwriting them.
-    private static boolean antiUse(LoadNode load, Node use) {
-        return switch( use ) {
-        case StoreNode st -> st._alias==load._alias;
-        case MemPhiNode phi -> phi._alias==load._alias;
-        case BulkMemPhiNode phi -> !phi.isSplit(load._alias);
-        default -> false;
-        };
-    }
-
-    private static CFGNode find_anti_dep(CFGNode lca, LoadNode load, CFGNode early, CFGNode[] late, int[] anti) {
-        // We could skip final-field loads here.
-        // Walk LCA->early, flagging Load's block location choices
-        for( CFGNode cfg=lca; early!=null && cfg!=early.idom(); cfg = cfg.idom() )
-            anti[cfg._nid] = load._nid;
-        // Walk load->mem uses, looking for Stores causing an anti-dep
-        for( Node mem : load.mem()._outputs ) {
-            if( !antiUse(load,mem) ) continue;
-            switch( mem ) {
-            case StoreNode st:
-                lca = anti_dep(load,late[st._nid],st.cfg0(),lca,st,anti);
-                break;
-            case PhiNode phi:
-                // Repeat anti-dep for matching Phi inputs.
-                // No anti-dep edges but may raise the LCA.
-                for( int i=1; i<phi.nIns(); i++ )
-                    if( phi.in(i)==load.mem() )
-                        lca = anti_dep(load,phi.region().cfg(i),load.mem().cfg0(),lca,null,anti);
-                break;
-            default: throw Utils.TODO();
-            }
-        }
-        return lca;
-    }
-
-    //
-    private static CFGNode anti_dep( LoadNode load, CFGNode stblk, CFGNode defblk, CFGNode lca, Node st, int[] anti ) {
-        // Preserve the full store range for the earlier evaluator scheduler.
-        // It places nodes independently of GCM and may hoist this store.
-        for( ; stblk != defblk.idom(); stblk = stblk.idom() ) {
-            // Store and Load overlap, need anti-dependence
-            if( anti[stblk._nid]==load._nid ) {
-                lca = stblk.domLCA(lca); // Raise Loads LCA
-                if( lca == stblk && st != null && Utils.find(st._inputs,load) == -1 ) // And if something moved,
-                    st.addDef(load);   // Add anti-dep as well
-                return lca;            // Cap this stores' anti-dep to here
-            }
-        }
-        return lca;
-    }
-```
+Since we're in the middle of `schedLate`, we have already computed all the late
+schedules of a Load's users, and we have the Loads *Least Common Ancestor* of
+uses, the LCA or late position.  We inspect the set of mem-defs that might
+impact the Load, and either add an anti-dependency from Store to Load, or raise
+the Loads effective LCA.  For Phi mem-defs, we look at the Phi inputs and place
+an effective use on that block; this will be used to raise the Load's LCA.  For
+stores, we do the same - until/unless we find stores with the SAME block as the
+Load's LCA. Then we add the anti-dependency edge to force ordering within the
+same block.
+
+See [`antiUse()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L222)
+for the alias filter, and
+[`find_anti_dep()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L231)
+for marking the Load's candidate blocks and inspecting competing memory users.
+[`anti_dep()`](src/main/java/com/seaofnodes/simple/GlobalCodeMotion.java#L257)
+walks the competing operation's dominator interval, raises the Load's LCA,
+and adds a Store-to-Load edge when required. It checks the Store's full interval
+because the evaluator's scheduler may place that Store independently of GCM.
 
 ## Video Walk Through
 
diff --git a/chapter11/docs/graph1.json b/chapter11/docs/graph1.json
index 748bdae9..2d58e0ba 100644
--- a/chapter11/docs/graph1.json
+++ b/chapter11/docs/graph1.json
@@ -2,32 +2,24 @@
   "ver": 1,
   "comp": "chapter11/docs/graph1.svg",
   "step": 1,
-  "roots": [],
+  "roots": [25],
   "scope": 0,
   "nodes": [
     {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 224, "role": "MEM", "label": null}], "proj": null},
     {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
-    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": null},
     {"id": 4, "label": "#0", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 5, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
     {"id": 6, "label": "$mem", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 2, "role": "MEM", "label": null}], "proj": {"par": 2, "idx": 1}},
-    {"id": 7, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 2}},
-    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 17, "role": "CTRL", "label": null}], "proj": {"par": 17, "idx": 0}},
-    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 10, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 17, "role": "CTRL", "label": null}], "proj": {"par": 17, "idx": 1}},
+    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
     {"id": 11, "label": "#2", "type": null, "kind": "DATA", "edges": [], "proj": null},
     {"id": 12, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 11, "role": "DATA", "label": null}], "proj": null},
-    {"id": 13, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 13, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
     {"id": 14, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 12, "role": "MEM", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
     {"id": 16, "label": ".f", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
-    {"id": 17, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}], "proj": null},
     {"id": 21, "label": "#1", "type": null, "kind": "DATA", "edges": [], "proj": null},
     {"id": 22, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}], "proj": null},
-    {"id": 23, "label": "Region", "type": null, "kind": "REGION", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 8, "role": "CTRL", "label": null}, {"idx": 2, "def": 10, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 25, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 23, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 16, "role": "DATA", "label": null}], "proj": null},
-    {"id": 224, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 23, "role": "ASSOC", "label": null}, {"idx": 1, "def": 22, "role": "MEM", "label": null}, {"idx": 2, "def": 14, "role": "MEM", "label": null}], "proj": null}
+    {"id": 25, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 16, "role": "DATA", "label": null}], "proj": null},
+    {"id": 224, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 22, "role": "MEM", "label": null}, {"idx": 2, "def": 14, "role": "MEM", "label": null}], "proj": null}
   ],
   "groups": [
-    {"id": 17, "par": 0, "nodes": [8, 10, 17, 22, 23, 224]}
   ]
 }
diff --git a/chapter11/docs/graph1.svg b/chapter11/docs/graph1.svg
index ef4d0293..93a2a03f 100644
--- a/chapter11/docs/graph1.svg
+++ b/chapter11/docs/graph1.svg
@@ -1,4 +1,4 @@
-<svg aria-label="Compiler graph" width="689" height="1044" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 689 1044" style="font-family: sans-serif;"><style>
+<svg aria-label="Compiler graph" width="565" height="766" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 565 766" style="font-family: sans-serif;"><style>
     html, body { height:100%; margin:0; font-family:sans-serif; }
     .viewer { height:100%; display:grid; grid-template-rows:auto minmax(0,1fr) auto; }
     .source { padding:8px; border-bottom:1px solid #ccc; }
@@ -60,92 +60,64 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(35,483)"><rect class="region-box" rx="8" width="433" height="250" fill="#f2f7ef"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e1i1" d="M340,118 L340,128 L24,128 L24,748 L268,748 L268,786" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M349,721 L349,748 L298,748 L298,786" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #224 · MEM</title></path><path class="edge CTRL" id="e3i0" d="M227,943 C227,967 344.5,970 344.5,994" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #25 · CTRL</title></path><path class="edge CTRL" id="e9i0" d="M220,118 L220,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#9[0] → #5 · CTRL</title></path><path class="edge MEM" id="e12i1" d="M340,118 L340,128 L149,128 L149,242 L278,242 L278,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#12[1] → #6 · MEM</title></path><path class="edge DATA" id="e12i2" d="M220,222 L220,232 L302,232 L302,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[2] → #9 · DATA</title></path><path class="edge DATA" id="e12i3" d="M372,222 L372,242 L326,242 L326,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[3] → #11 · DATA</title></path><path class="edge CTRL" id="e13i0" d="M220,118 L220,148 L442,148 L442,270" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#13[0] → #5 · CTRL</title></path><path class="edge MEM" id="e14i1" d="M290,326 L290,346 L443,346 L443,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#14[1] → #12 · MEM</title></path><path class="edge DATA" id="e14i2" d="M442,326 L442,336 L467,336 L467,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge DATA" id="e14i3" d="M594,326 L594,336 L491,336 L491,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[3] → #4 · DATA</title></path><path class="edge MEM" id="e16i1" d="M455,430 L455,450 L560,450 L560,546" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#16[1] → #14 · MEM</title></path><path class="edge DATA" id="e16i2" d="M220,222 L220,232 L664,232 L664,440 L590,440 L590,546" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #9 · DATA</title></path><path class="edge CTRL" id="e17i0" d="M220,118 L220,148 L127,148 L127,517" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#17[0] → #5 · CTRL</title></path><path class="edge DATA" id="e17i1" d="M460,118 L460,138 L138,138 L138,440 L207,440 L207,517" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#17[1] → #7 · DATA</title></path><path class="edge MEM" id="e22i1" d="M455,430 L455,450 L373,450 L373,528" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#22[1] → #14 · MEM</title></path><path class="edge DATA" id="e22i2" d="M220,222 L220,232 L219,232 L219,460 L397,460 L397,528" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #9 · DATA</title></path><path class="edge DATA" id="e22i3" d="M303,430 L303,440 L421,440 L421,528" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[3] → #21 · DATA</title></path><path class="edge CTRL" id="e23i1" d="M107,617 L107,627 L197,627 L197,665" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#23[1] → #8 · CTRL</title></path><path class="edge CTRL" id="e23i2" d="M227,617 L227,665" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#23[2] → #10 · CTRL</title></path><path class="edge CTRL" id="e25i0" d="M197,721 L197,890" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#25[0] → #23 · CTRL</title></path><path class="edge MEM" id="e25i1" d="M268,842 L268,852 L227,852 L227,890" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#25[1] → #1 · MEM</title></path><path class="edge DATA" id="e25i2" d="M560,602 L560,862 L257,862 L257,890" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[2] → #16 · DATA</title></path><path class="edge MEM" id="e224i1" d="M385,584 L385,627 L329,627 L329,665" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[1] → #22 · MEM</title></path><path class="edge MEM" id="e224i2" d="M455,430 L455,637 L369,637 L369,665" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[2] → #14 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(208,792)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e1i1" d="M84,118 L84,536 Q84,544 92,544 L137,544 Q145,544 145,552 L145,582" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M175,534 L175,582" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #224 · MEM</title></path><path class="edge MEM" id="e12i1" d="M84,118 L84,130 Q84,138 92,138 L146,138 Q154,138 154,146 L154,166" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#12[1] → #6 · MEM</title></path><path class="edge DATA" id="e12i2" d="M242,118 L242,123 Q242,128 237,128 L186,128 Q178,128 178,136 L178,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[2] → #9 · DATA</title></path><path class="edge DATA" id="e12i3" d="M394,118 L394,130 Q394,138 386,138 L210,138 Q202,138 202,146 L202,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[3] → #11 · DATA</title></path><path class="edge MEM" id="e14i1" d="M166,222 L166,227 Q166,232 171,232 L298,232 Q306,232 306,240 L306,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#14[1] → #12 · MEM</title></path><path class="edge DATA" id="e14i2" d="M318,222 L318,227 Q318,232 323,232 L324,232 Q330,232 330,238 L330,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge DATA" id="e14i3" d="M470,222 L470,227 Q470,232 465,232 L362,232 Q354,232 354,240 L354,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[3] → #4 · DATA</title></path><path class="edge MEM" id="e16i1" d="M318,326 L318,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#16[1] → #14 · MEM</title></path><path class="edge DATA" id="e16i2" d="M242,118 L242,123 Q242,128 247,128 L532,128 Q540,128 540,136 L540,328 Q540,336 532,336 L356,336 Q348,336 348,344 L348,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #9 · DATA</title></path><path class="edge MEM" id="e22i1" d="M318,326 L318,338 Q318,346 310,346 L151,346 Q143,346 143,354 L143,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#22[1] → #14 · MEM</title></path><path class="edge DATA" id="e22i2" d="M242,118 L242,123 Q242,128 237,128 L103,128 Q95,128 95,136 L95,348 Q95,356 103,356 L159,356 Q167,356 167,364 L167,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #9 · DATA</title></path><path class="edge DATA" id="e22i3" d="M166,326 L166,331 Q166,336 171,336 L183,336 Q191,336 191,344 L191,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[3] → #21 · DATA</title></path><path class="edge MEM" id="e25i1" d="M145,638 L145,643 Q145,648 150,648 L280,648 Q288,648 288,656 L288,686" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#25[1] → #1 · MEM</title></path><path class="edge DATA" id="e25i2" d="M318,430 L318,686" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[2] → #16 · DATA</title></path><path class="edge MEM" id="e224i1" d="M155,430 L155,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[1] → #22 · MEM</title></path><path class="edge MEM" id="e224i2" d="M318,326 L318,338 Q318,346 310,346 L233,346 Q225,346 225,354 L225,432 Q225,440 217,440 L203,440 Q195,440 195,448 L195,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[2] → #14 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(85,588)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
 Type not computed
 
 [0] → —  DATA
 [1] → #6  MEM
-[2] → #224  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(160,24)" style="opacity: 1;"><path class="box" d="M0,0H360V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="180" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="180"/><title>#2 Start
+[2] → #224  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(24,24)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#2 Start
 Type not computed
 
-</title></g><g class="node" id="n3" data-id="3" transform="translate(308.5,994)" style="opacity: 1;"><path class="box" d="M0,0H72V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="36" y="17"><tspan>Stop</tspan><tspan class="node-id">  #3</tspan></text><text class="type" text-anchor="middle" y="35" x="36"/><title>#3 Stop
+</title></g><g class="node" id="n4" data-id="4" transform="translate(410,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
 Type not computed
 
-[0] → #25  CTRL</title><circle class="port" cx="36" cy="0" r="3" fill="#536477"/><text class="slot" x="36" y="-7" text-anchor="middle">0</text></g><g class="node" id="n4" data-id="4" transform="translate(534,276)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
-Type not computed
-
-</title></g><g class="node" id="n5" data-id="5" transform="translate(160,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 $ctrl
-Projection 0 of #2
-Type not computed
-
-[0] → #2  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(280,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
+</title></g><g class="node" id="n6" data-id="6" transform="translate(24,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
 Projection 1 of #2
 Type not computed
 
-[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(400,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
-Projection 2 of #2
-Type not computed
-
-[0] → #2  DATA</title></g><g class="node" id="n8" data-id="8" transform="translate(47,567)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 True
-Projection 0 of #17
-Type not computed
-
-[0] → #17  CTRL</title></g><g class="node" id="n9" data-id="9" transform="translate(160,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
+[0] → #2  MEM</title></g><g class="node" id="n9" data-id="9" transform="translate(182,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
 Type not computed
 
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(167,567)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #10/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 False
-Projection 1 of #17
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n11" data-id="11" transform="translate(334,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#2</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 #2
 Type not computed
 
-[0] → #17  CTRL</title></g><g class="node" id="n11" data-id="11" transform="translate(312,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#2</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 #2
-Type not computed
-
-</title></g><g class="node" id="n12" data-id="12" transform="translate(230,276)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 .f =
+</title></g><g class="node" id="n12" data-id="12" transform="translate(106,172)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 .f =
 Type not computed
 
 [0] → —  DATA
 [1] → #6  MEM
 [2] → #9  DATA
-[3] → #11  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n13" data-id="13" transform="translate(382,276)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 new S
+[3] → #11  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n13" data-id="13" transform="translate(258,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 new S
 Type not computed
 
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n14" data-id="14" transform="translate(395,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 .f =
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n14" data-id="14" transform="translate(258,276)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 .f =
 Type not computed
 
 [0] → —  DATA
 [1] → #12  MEM
 [2] → #13  DATA
-[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(500,552)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 .f
+[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(258,380)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 .f
 Type not computed
 
 [0] → —  DATA
 [1] → #14  MEM
-[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n17" data-id="17" transform="translate(47,523)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #17</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#17 If
-Type not computed
-
-[0] → #5  CTRL
-[1] → #7  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n21" data-id="21" transform="translate(243,380)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 #1
+[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n21" data-id="21" transform="translate(106,276)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 #1
 Type not computed
 
-</title></g><g class="node" id="n22" data-id="22" transform="translate(325,534)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 .f =
+</title></g><g class="node" id="n22" data-id="22" transform="translate(95,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 .f =
 Type not computed
 
 [0] → —  DATA
 [1] → #14  MEM
 [2] → #9  DATA
-[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n23" data-id="23" transform="translate(137,671)" style="opacity: 1;"><path class="box" d="M12,0H108L120,44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Region</tspan><tspan class="node-id">  #23</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#23 Region
-Type not computed
-
-[0] → —  DATA
-[1] → #8  CTRL
-[2] → #10  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n25" data-id="25" transform="translate(167,896)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#25 Return
+[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n25" data-id="25" transform="translate(228,692)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#25 Return
 Type not computed
 
-[0] → #23  CTRL
+[0] → —  CTRL
 [1] → #1  MEM
-[2] → #16  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n224" data-id="224" transform="translate(289,671)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #224</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#224 MemPhi_2
+[2] → #16  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n224" data-id="224" transform="translate(115,484)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #224</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#224 MemPhi_2
 Type not computed
 
-[0] → #23  ASSOC
+[0] → —  ASSOC
 [1] → #22  MEM
-[2] → #14  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #23</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(35,483)"><text class="label" x="26" y="17"><tspan>If</tspan><tspan class="node-id">  #17</tspan></text><title>If · 6 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #17"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g></g><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
+[2] → #14  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"/><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
diff --git a/chapter11/docs/graph2.json b/chapter11/docs/graph2.json
index 7c50307d..602c1584 100644
--- a/chapter11/docs/graph2.json
+++ b/chapter11/docs/graph2.json
@@ -2,32 +2,24 @@
   "ver": 1,
   "comp": "chapter11/docs/graph2.svg",
   "step": 1,
-  "roots": [],
+  "roots": [25],
   "scope": 0,
   "nodes": [
-    {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 23, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 224, "role": "MEM", "label": null}], "proj": null},
+    {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 224, "role": "MEM", "label": null}], "proj": null},
     {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
-    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": null},
     {"id": 4, "label": "#0", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 5, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
     {"id": 6, "label": "$mem", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 2, "role": "MEM", "label": null}], "proj": {"par": 2, "idx": 1}},
-    {"id": 7, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 2}},
-    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 17, "role": "CTRL", "label": null}], "proj": {"par": 17, "idx": 0}},
-    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 10, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 17, "role": "CTRL", "label": null}], "proj": {"par": 17, "idx": 1}},
+    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
     {"id": 11, "label": "#2", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 12, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 11, "role": "DATA", "label": null}], "proj": null},
-    {"id": 13, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 14, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 12, "role": "MEM", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
-    {"id": 16, "label": ".f", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
-    {"id": 17, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}], "proj": null},
+    {"id": 12, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 11, "role": "DATA", "label": null}], "proj": null},
+    {"id": 13, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 14, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 12, "role": "MEM", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
+    {"id": 16, "label": ".f", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
     {"id": 21, "label": "#1", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 22, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}], "proj": null},
-    {"id": 23, "label": "Region", "type": null, "kind": "REGION", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 8, "role": "CTRL", "label": null}, {"idx": 2, "def": 10, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 25, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 23, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 16, "role": "DATA", "label": null}], "proj": null},
-    {"id": 224, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 23, "role": "ASSOC", "label": null}, {"idx": 1, "def": 22, "role": "MEM", "label": null}, {"idx": 2, "def": 14, "role": "MEM", "label": null}], "proj": null}
+    {"id": 22, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}], "proj": null},
+    {"id": 25, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 16, "role": "DATA", "label": null}], "proj": null},
+    {"id": 224, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 22, "role": "MEM", "label": null}, {"idx": 2, "def": 14, "role": "MEM", "label": null}], "proj": null}
   ],
   "groups": [
-    {"id": 17, "par": 0, "nodes": [1, 8, 10, 17, 23, 224]}
   ]
 }
diff --git a/chapter11/docs/graph2.svg b/chapter11/docs/graph2.svg
index a3afd14f..05210749 100644
--- a/chapter11/docs/graph2.svg
+++ b/chapter11/docs/graph2.svg
@@ -1,4 +1,4 @@
-<svg aria-label="Compiler graph" width="730" height="1150" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 730 1150" style="font-family: sans-serif;"><style>
+<svg aria-label="Compiler graph" width="565" height="766" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 565 766" style="font-family: sans-serif;"><style>
     html, body { height:100%; margin:0; font-family:sans-serif; }
     .viewer { height:100%; display:grid; grid-template-rows:auto minmax(0,1fr) auto; }
     .source { padding:8px; border-bottom:1px solid #ccc; }
@@ -60,92 +60,64 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(24,589)"><rect class="region-box" rx="8" width="371" height="354" fill="#f2f7ef"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e1i0" d="M160,827 L160,837 L201,837 L201,875" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#1[0] → #23 · CTRL</title></path><path class="edge MEM" id="e1i1" d="M280,118 L280,138 L605,138 L605,338 L575,338 L575,442 L382,442 L382,837 L231,837 L231,875" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M312,827 L312,847 L261,847 L261,875" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #224 · MEM</title></path><path class="edge CTRL" id="e3i0" d="M190,1049 C190,1073 365,1076 365,1100" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #25 · CTRL</title></path><path class="edge CTRL" id="e9i0" d="M160,118 L160,148 L242,148 L242,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#9[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e12i0" d="M160,118 L160,262 L195,262 L195,272" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#12[0] → #5 · CTRL</title></path><path class="edge MEM" id="e12i1" d="M280,118 L280,138 L171,138 L171,232 L219,232 L219,272" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#12[1] → #6 · MEM</title></path><path class="edge DATA" id="e12i2" d="M242,222 L242,252 L243,252 L243,272" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[2] → #9 · DATA</title></path><path class="edge DATA" id="e12i3" d="M394,222 L394,232 L267,232 L267,272" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[3] → #11 · DATA</title></path><path class="edge CTRL" id="e13i0" d="M160,118 L160,148 L464,148 L464,242 L383,242 L383,272" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#13[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e14i0" d="M160,118 L160,348 L336,348 L336,376" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#14[0] → #5 · CTRL</title></path><path class="edge MEM" id="e14i1" d="M231,328 L231,338 L360,338 L360,376" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#14[1] → #12 · MEM</title></path><path class="edge DATA" id="e14i2" d="M383,328 L383,338 L384,338 L384,376" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge DATA" id="e14i3" d="M535,328 L535,338 L408,338 L408,376" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[3] → #4 · DATA</title></path><path class="edge CTRL" id="e16i0" d="M160,118 L160,148 L616,148 L616,480" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#16[0] → #5 · CTRL</title></path><path class="edge MEM" id="e16i1" d="M372,432 L372,452 L646,452 L646,480" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#16[1] → #14 · MEM</title></path><path class="edge DATA" id="e16i2" d="M242,222 L242,252 L627,252 L627,442 L676,442 L676,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #9 · DATA</title></path><path class="edge CTRL" id="e17i0" d="M160,118 L160,148 L116,148 L116,623" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#17[0] → #5 · CTRL</title></path><path class="edge DATA" id="e17i1" d="M400,118 L400,128 L127,128 L127,556 L196,556 L196,623" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#17[1] → #7 · DATA</title></path><path class="edge CTRL" id="e22i0" d="M160,118 L160,262 L138,262 L138,452 L162,452 L162,480" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#22[0] → #5 · CTRL</title></path><path class="edge MEM" id="e22i1" d="M372,432 L372,452 L186,452 L186,480" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#22[1] → #14 · MEM</title></path><path class="edge DATA" id="e22i2" d="M242,222 L242,252 L149,252 L149,442 L210,442 L210,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #9 · DATA</title></path><path class="edge DATA" id="e22i3" d="M220,432 L220,462 L234,462 L234,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[3] → #21 · DATA</title></path><path class="edge CTRL" id="e23i1" d="M96,723 L96,733 L160,733 L160,771" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#23[1] → #8 · CTRL</title></path><path class="edge CTRL" id="e23i2" d="M216,723 L216,733 L190,733 L190,771" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#23[2] → #10 · CTRL</title></path><path class="edge CTRL" id="e25i0" d="M160,827 L160,996" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#25[0] → #23 · CTRL</title></path><path class="edge MEM" id="e25i1" d="M231,931 L231,958 L190,958 L190,996" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#25[1] → #1 · MEM</title></path><path class="edge DATA" id="e25i2" d="M646,536 L646,968 L220,968 L220,996" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[2] → #16 · DATA</title></path><path class="edge MEM" id="e224i1" d="M198,536 L198,546 L292,546 L292,771" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[1] → #22 · MEM</title></path><path class="edge MEM" id="e224i2" d="M372,432 L372,452 L332,452 L332,771" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[2] → #14 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(171,881)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e1i1" d="M84,118 L84,536 Q84,544 92,544 L137,544 Q145,544 145,552 L145,582" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M175,534 L175,582" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #224 · MEM</title></path><path class="edge MEM" id="e12i1" d="M84,118 L84,130 Q84,138 92,138 L146,138 Q154,138 154,146 L154,166" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#12[1] → #6 · MEM</title></path><path class="edge DATA" id="e12i2" d="M242,118 L242,123 Q242,128 237,128 L186,128 Q178,128 178,136 L178,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[2] → #9 · DATA</title></path><path class="edge DATA" id="e12i3" d="M394,118 L394,130 Q394,138 386,138 L210,138 Q202,138 202,146 L202,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[3] → #11 · DATA</title></path><path class="edge MEM" id="e14i1" d="M166,222 L166,227 Q166,232 171,232 L298,232 Q306,232 306,240 L306,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#14[1] → #12 · MEM</title></path><path class="edge DATA" id="e14i2" d="M318,222 L318,227 Q318,232 323,232 L324,232 Q330,232 330,238 L330,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge DATA" id="e14i3" d="M470,222 L470,227 Q470,232 465,232 L362,232 Q354,232 354,240 L354,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[3] → #4 · DATA</title></path><path class="edge MEM" id="e16i1" d="M318,326 L318,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#16[1] → #14 · MEM</title></path><path class="edge DATA" id="e16i2" d="M242,118 L242,123 Q242,128 247,128 L532,128 Q540,128 540,136 L540,328 Q540,336 532,336 L356,336 Q348,336 348,344 L348,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #9 · DATA</title></path><path class="edge MEM" id="e22i1" d="M318,326 L318,338 Q318,346 310,346 L151,346 Q143,346 143,354 L143,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#22[1] → #14 · MEM</title></path><path class="edge DATA" id="e22i2" d="M242,118 L242,123 Q242,128 237,128 L103,128 Q95,128 95,136 L95,348 Q95,356 103,356 L159,356 Q167,356 167,364 L167,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #9 · DATA</title></path><path class="edge DATA" id="e22i3" d="M166,326 L166,331 Q166,336 171,336 L183,336 Q191,336 191,344 L191,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[3] → #21 · DATA</title></path><path class="edge MEM" id="e25i1" d="M145,638 L145,643 Q145,648 150,648 L280,648 Q288,648 288,656 L288,686" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#25[1] → #1 · MEM</title></path><path class="edge DATA" id="e25i2" d="M318,430 L318,686" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[2] → #16 · DATA</title></path><path class="edge MEM" id="e224i1" d="M155,430 L155,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[1] → #22 · MEM</title></path><path class="edge MEM" id="e224i2" d="M318,326 L318,338 Q318,346 310,346 L233,346 Q225,346 225,354 L225,432 Q225,440 217,440 L203,440 Q195,440 195,448 L195,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[2] → #14 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(85,588)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
 Type not computed
 
-[0] → #23  CTRL
+[0] → —  CTRL
 [1] → #6  MEM
-[2] → #224  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(100,24)" style="opacity: 1;"><path class="box" d="M0,0H360V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="180" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="180"/><title>#2 Start
+[2] → #224  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(24,24)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#2 Start
 Type not computed
 
-</title></g><g class="node" id="n3" data-id="3" transform="translate(329,1100)" style="opacity: 1;"><path class="box" d="M0,0H72V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="36" y="17"><tspan>Stop</tspan><tspan class="node-id">  #3</tspan></text><text class="type" text-anchor="middle" y="35" x="36"/><title>#3 Stop
+</title></g><g class="node" id="n4" data-id="4" transform="translate(410,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
 Type not computed
 
-[0] → #25  CTRL</title><circle class="port" cx="36" cy="0" r="3" fill="#536477"/><text class="slot" x="36" y="-7" text-anchor="middle">0</text></g><g class="node" id="n4" data-id="4" transform="translate(475,278)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
-Type not computed
-
-</title></g><g class="node" id="n5" data-id="5" transform="translate(100,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 $ctrl
-Projection 0 of #2
-Type not computed
-
-[0] → #2  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(220,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
+</title></g><g class="node" id="n6" data-id="6" transform="translate(24,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
 Projection 1 of #2
 Type not computed
 
-[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(340,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
-Projection 2 of #2
-Type not computed
-
-[0] → #2  DATA</title></g><g class="node" id="n8" data-id="8" transform="translate(36,673)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 True
-Projection 0 of #17
-Type not computed
-
-[0] → #17  CTRL</title></g><g class="node" id="n9" data-id="9" transform="translate(182,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
-Type not computed
-
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(156,673)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #10/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 False
-Projection 1 of #17
+[0] → #2  MEM</title></g><g class="node" id="n9" data-id="9" transform="translate(182,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
 Type not computed
 
-[0] → #17  CTRL</title></g><g class="node" id="n11" data-id="11" transform="translate(334,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#2</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 #2
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n11" data-id="11" transform="translate(334,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#2</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 #2
 Type not computed
 
-</title></g><g class="node" id="n12" data-id="12" transform="translate(171,278)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 .f =
+</title></g><g class="node" id="n12" data-id="12" transform="translate(106,172)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 .f =
 Type not computed
 
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #6  MEM
 [2] → #9  DATA
-[3] → #11  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n13" data-id="13" transform="translate(323,278)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 new S
+[3] → #11  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n13" data-id="13" transform="translate(258,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 new S
 Type not computed
 
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n14" data-id="14" transform="translate(312,382)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 .f =
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n14" data-id="14" transform="translate(258,276)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 .f =
 Type not computed
 
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #12  MEM
 [2] → #13  DATA
-[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(586,486)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 .f
+[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(258,380)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 .f
 Type not computed
 
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #14  MEM
-[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n17" data-id="17" transform="translate(36,629)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #17</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#17 If
+[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n21" data-id="21" transform="translate(106,276)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 #1
 Type not computed
 
-[0] → #5  CTRL
-[1] → #7  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n21" data-id="21" transform="translate(160,382)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 #1
+</title></g><g class="node" id="n22" data-id="22" transform="translate(95,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 .f =
 Type not computed
 
-</title></g><g class="node" id="n22" data-id="22" transform="translate(138,486)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 .f =
-Type not computed
-
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #14  MEM
 [2] → #9  DATA
-[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n23" data-id="23" transform="translate(100,777)" style="opacity: 1;"><path class="box" d="M12,0H108L120,44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Region</tspan><tspan class="node-id">  #23</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#23 Region
-Type not computed
-
-[0] → —  DATA
-[1] → #8  CTRL
-[2] → #10  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n25" data-id="25" transform="translate(130,1002)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#25 Return
+[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n25" data-id="25" transform="translate(228,692)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#25 Return
 Type not computed
 
-[0] → #23  CTRL
+[0] → —  CTRL
 [1] → #1  MEM
-[2] → #16  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n224" data-id="224" transform="translate(252,777)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #224</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#224 MemPhi_2
+[2] → #16  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n224" data-id="224" transform="translate(115,484)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #224</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#224 MemPhi_2
 Type not computed
 
-[0] → #23  ASSOC
+[0] → —  ASSOC
 [1] → #22  MEM
-[2] → #14  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #23</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(24,589)"><text class="label" x="26" y="17"><tspan>If</tspan><tspan class="node-id">  #17</tspan></text><title>If · 6 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #17"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g></g><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
+[2] → #14  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"/><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
diff --git a/chapter11/docs/graph3-snip.json b/chapter11/docs/graph3-snip.json
index 00b3e744..7dade538 100644
--- a/chapter11/docs/graph3-snip.json
+++ b/chapter11/docs/graph3-snip.json
@@ -2,16 +2,13 @@
   "ver": 1,
   "comp": "chapter11/docs/graph3-snip.svg",
   "step": 1,
-  "roots": [],
+  "roots": [22],
   "scope": 0,
   "nodes": [
-    {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
-    {"id": 5, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
-    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 17, "role": "CTRL", "label": null}], "proj": {"par": 17, "idx": 0}},
-    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 14, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 0, "role": "MEM", "label": null}, {"idx": 2, "def": 0, "role": "DATA", "label": null}, {"idx": 3, "def": 0, "role": "DATA", "label": null}], "proj": null},
-    {"id": 16, "label": ".f", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
-    {"id": 17, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 0, "role": "DATA", "label": null}], "proj": null},
+    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [], "proj": {"par": 0, "idx": 0}},
+    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 14, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 0, "role": "MEM", "label": null}, {"idx": 2, "def": 0, "role": "DATA", "label": null}, {"idx": 3, "def": 0, "role": "DATA", "label": null}], "proj": null},
+    {"id": 16, "label": ".f", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
     {"id": 21, "label": "#1", "type": null, "kind": "DATA", "edges": [], "proj": null},
     {"id": 22, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 8, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}, {"idx": 4, "def": 16, "role": "DATA", "label": null}], "proj": null}
   ],
diff --git a/chapter11/docs/graph3-snip.svg b/chapter11/docs/graph3-snip.svg
index cf6420c5..9f5218af 100644
--- a/chapter11/docs/graph3-snip.svg
+++ b/chapter11/docs/graph3-snip.svg
@@ -1,4 +1,4 @@
-<svg aria-label="Compiler graph" width="478" height="500" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 478 500" style="font-family: sans-serif;"><style>
+<svg aria-label="Compiler graph" width="427" height="314" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 427 314" style="font-family: sans-serif;"><style>
     html, body { height:100%; margin:0; font-family:sans-serif; }
     .viewer { height:100%; display:grid; grid-template-rows:auto minmax(0,1fr) auto; }
     .source { padding:8px; border-bottom:1px solid #ccc; }
@@ -60,39 +60,28 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e9i0" d="M124,118 L124,128 L301,128 L301,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#9[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e14i0" d="M124,118 L124,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#14[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e16i0" d="M124,118 L124,128 L230,128 L230,242 L364,242 L364,281" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#16[0] → #5 · CTRL</title></path><path class="edge MEM" id="e16i1" d="M160,222 L160,252 L394,252 L394,281" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#16[1] → #14 · MEM</title></path><path class="edge DATA" id="e16i2" d="M301,222 L301,232 L424,232 L424,281" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #9 · DATA</title></path><path class="edge CTRL" id="e17i0" d="M124,118 L124,128 L64,128 L64,270" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#17[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e22i0" d="M84,370 L84,420" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#22[0] → #8 · CTRL</title></path><path class="edge MEM" id="e22i1" d="M160,222 L160,380 L104,380 L104,420" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#22[1] → #14 · MEM</title></path><path class="edge DATA" id="e22i2" d="M301,222 L301,232 L171,232 L171,390 L124,390 L124,420" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #9 · DATA</title></path><path class="edge DATA" id="e22i3" d="M242,370 L242,400 L144,400 L144,420" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[3] → #21 · DATA</title></path><path class="edge DATA" id="e22i4" d="M394,337 L394,410 L164,410 L164,420" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[4] → #16 · DATA</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n2" data-id="2" transform="translate(64,24)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#2 Start
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e16i1" d="M109,80 L109,92 Q109,100 117,100 L335,100 Q343,100 343,108 L343,128" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#16[1] → #14 · MEM</title></path><path class="edge DATA" id="e16i2" d="M261,80 L261,85 Q261,90 266,90 L365,90 Q373,90 373,98 L373,128" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #9 · DATA</title></path><path class="edge CTRL" id="e22i0" d="M62,184 L62,234" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#22[0] → #8 · CTRL</title></path><path class="edge MEM" id="e22i1" d="M109,80 L109,186 Q109,194 101,194 L90,194 Q82,194 82,202 L82,234" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#22[1] → #14 · MEM</title></path><path class="edge DATA" id="e22i2" d="M261,80 L261,85 Q261,90 256,90 L128,90 Q120,90 120,98 L120,196 Q120,204 112,204 L110,204 Q102,204 102,212 L102,234" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #9 · DATA</title></path><path class="edge DATA" id="e22i3" d="M191,184 L191,206 Q191,214 183,214 L130,214 Q122,214 122,222 L122,234" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[3] → #21 · DATA</title></path><path class="edge DATA" id="e22i4" d="M343,184 L343,216 Q343,224 335,224 L147,224 Q142,224 142,229 L142,234" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[4] → #16 · DATA</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n8" data-id="8" transform="translate(24,152)" style="opacity: 1;"><path class="box" d="M0,0H75V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="37.5" y="17"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="37.5"/><title>#8 True
+Projection 0 of #0
 Type not computed
 
-</title></g><g class="node" id="n5" data-id="5" transform="translate(64,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 $ctrl
-Projection 0 of #2
+</title></g><g class="node" id="n9" data-id="9" transform="translate(201,30)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
 Type not computed
 
-[0] → #2  CTRL</title></g><g class="node" id="n8" data-id="8" transform="translate(24,320)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 True
-Projection 0 of #17
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n14" data-id="14" transform="translate(49,30)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 .f =
 Type not computed
 
-[0] → #17  CTRL</title></g><g class="node" id="n9" data-id="9" transform="translate(241,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
-Type not computed
-
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n14" data-id="14" transform="translate(100,172)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 .f =
-Type not computed
-
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → —  MEM
 [2] → —  DATA
-[3] → —  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="white"/><circle class="port" cx="72" cy="-3" r="3" fill="white"/><circle class="port" cx="96" cy="-3" r="3" fill="white"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(334,287)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 .f
+[3] → —  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="white"/><circle class="port" cx="72" cy="-3" r="3" fill="white"/><circle class="port" cx="96" cy="-3" r="3" fill="white"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(283,134)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 .f
 Type not computed
 
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #14  MEM
-[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n17" data-id="17" transform="translate(24,276)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>If</tspan><tspan class="node-id">  #17</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#17 If
-Type not computed
-
-[0] → #5  CTRL
-[1] → —  DATA</title><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="white"/><text class="slot" x="40" y="-10" text-anchor="middle">0</text><text class="slot" x="80" y="-10" text-anchor="middle">1</text></g><g class="node" id="n21" data-id="21" transform="translate(182,320)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 #1
+[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n21" data-id="21" transform="translate(131,134)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 #1
 Type not computed
 
-</title></g><g class="node" id="n22" data-id="22" transform="translate(64,426)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 .f =
+</title></g><g class="node" id="n22" data-id="22" transform="translate(42,240)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 .f =
 Type not computed
 
 [0] → #8  CTRL
diff --git a/chapter11/docs/graph3.json b/chapter11/docs/graph3.json
index 998c6f87..577d7c3b 100644
--- a/chapter11/docs/graph3.json
+++ b/chapter11/docs/graph3.json
@@ -2,32 +2,25 @@
   "ver": 1,
   "comp": "chapter11/docs/graph3.svg",
   "step": 1,
-  "roots": [],
+  "roots": [25],
   "scope": 0,
   "nodes": [
-    {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 23, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 224, "role": "MEM", "label": null}], "proj": null},
+    {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 224, "role": "MEM", "label": null}], "proj": null},
     {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
-    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": null},
     {"id": 4, "label": "#0", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 5, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
     {"id": 6, "label": "$mem", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 2, "role": "MEM", "label": null}], "proj": {"par": 2, "idx": 1}},
-    {"id": 7, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 2}},
-    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 17, "role": "CTRL", "label": null}], "proj": {"par": 17, "idx": 0}},
-    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 10, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 17, "role": "CTRL", "label": null}], "proj": {"par": 17, "idx": 1}},
+    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [], "proj": {"par": 0, "idx": 0}},
+    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
     {"id": 11, "label": "#2", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 12, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 11, "role": "DATA", "label": null}], "proj": null},
-    {"id": 13, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 14, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 12, "role": "MEM", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
-    {"id": 16, "label": ".f", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
-    {"id": 17, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}], "proj": null},
+    {"id": 12, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 11, "role": "DATA", "label": null}], "proj": null},
+    {"id": 13, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 14, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 12, "role": "MEM", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
+    {"id": 16, "label": ".f", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
     {"id": 21, "label": "#1", "type": null, "kind": "DATA", "edges": [], "proj": null},
     {"id": 22, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 8, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}, {"idx": 4, "def": 16, "role": "DATA", "label": null}], "proj": null},
-    {"id": 23, "label": "Region", "type": null, "kind": "REGION", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 8, "role": "CTRL", "label": null}, {"idx": 2, "def": 10, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 25, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 23, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 16, "role": "DATA", "label": null}], "proj": null},
-    {"id": 224, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 23, "role": "ASSOC", "label": null}, {"idx": 1, "def": 22, "role": "MEM", "label": null}, {"idx": 2, "def": 14, "role": "MEM", "label": null}], "proj": null}
+    {"id": 25, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 16, "role": "DATA", "label": null}], "proj": null},
+    {"id": 224, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 22, "role": "MEM", "label": null}, {"idx": 2, "def": 14, "role": "MEM", "label": null}], "proj": null}
   ],
   "groups": [
-    {"id": 17, "par": 0, "nodes": [1, 8, 10, 17, 22, 23, 224]}
   ]
 }
diff --git a/chapter11/docs/graph3.svg b/chapter11/docs/graph3.svg
index 6fe5fe73..0247b5c6 100644
--- a/chapter11/docs/graph3.svg
+++ b/chapter11/docs/graph3.svg
@@ -1,4 +1,4 @@
-<svg aria-label="Compiler graph" width="719" height="1268" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 719 1268" style="font-family: sans-serif;"><style>
+<svg aria-label="Compiler graph" width="661" height="872" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 661 872" style="font-family: sans-serif;"><style>
     html, body { height:100%; margin:0; font-family:sans-serif; }
     .viewer { height:100%; display:grid; grid-template-rows:auto minmax(0,1fr) auto; }
     .source { padding:8px; border-bottom:1px solid #ccc; }
@@ -60,93 +60,69 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(24,591)"><rect class="region-box" rx="8" width="336" height="470" fill="#f2f7ef"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e1i0" d="M96,945 L96,955 L137,955 L137,993" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#1[0] → #23 · CTRL</title></path><path class="edge MEM" id="e1i1" d="M269,118 L269,138 L694,138 L694,556 L347,556 L347,955 L167,955 L167,993" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M248,945 L248,965 L197,965 L197,993" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #224 · MEM</title></path><path class="edge CTRL" id="e3i0" d="M126,1167 C126,1191 359.5,1194 359.5,1218" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #25 · CTRL</title></path><path class="edge CTRL" id="e9i0" d="M149,118 L149,148 L231,148 L231,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#9[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e12i0" d="M149,118 L149,252 L184,252 L184,272" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#12[0] → #5 · CTRL</title></path><path class="edge MEM" id="e12i1" d="M269,118 L269,138 L160,138 L160,232 L208,232 L208,272" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#12[1] → #6 · MEM</title></path><path class="edge DATA" id="e12i2" d="M231,222 L231,242 L232,242 L232,272" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[2] → #9 · DATA</title></path><path class="edge DATA" id="e12i3" d="M383,222 L383,252 L256,252 L256,272" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[3] → #11 · DATA</title></path><path class="edge CTRL" id="e13i0" d="M149,118 L149,148 L594,148 L594,262 L372,262 L372,272" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#13[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e14i0" d="M149,118 L149,338 L173,338 L173,376" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#14[0] → #5 · CTRL</title></path><path class="edge MEM" id="e14i1" d="M220,328 L220,338 L197,338 L197,376" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#14[1] → #12 · MEM</title></path><path class="edge DATA" id="e14i2" d="M372,328 L372,348 L221,348 L221,376" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge DATA" id="e14i3" d="M524,328 L524,358 L245,358 L245,376" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[3] → #4 · DATA</title></path><path class="edge CTRL" id="e16i0" d="M149,118 L149,148 L594,148 L594,480" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#16[0] → #5 · CTRL</title></path><path class="edge MEM" id="e16i1" d="M209,432 L209,452 L624,452 L624,480" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#16[1] → #14 · MEM</title></path><path class="edge DATA" id="e16i2" d="M231,222 L231,242 L605,242 L605,442 L654,442 L654,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #9 · DATA</title></path><path class="edge CTRL" id="e17i0" d="M149,118 L149,148 L116,148 L116,625" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#17[0] → #5 · CTRL</title></path><path class="edge DATA" id="e17i1" d="M389,118 L389,128 L127,128 L127,576 L196,576 L196,625" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#17[1] → #7 · DATA</title></path><path class="edge CTRL" id="e22i0" d="M96,725 L96,745 L157,745 L157,785" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#22[0] → #8 · CTRL</title></path><path class="edge MEM" id="e22i1" d="M209,432 L209,452 L138,452 L138,566 L292,566 L292,745 L177,745 L177,785" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#22[1] → #14 · MEM</title></path><path class="edge DATA" id="e22i2" d="M231,222 L231,242 L138,242 L138,442 L149,442 L149,556 L303,556 L303,755 L197,755 L197,785" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #9 · DATA</title></path><path class="edge DATA" id="e22i3" d="M266,536 L266,546 L314,546 L314,765 L217,765 L217,785" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[3] → #21 · DATA</title></path><path class="edge DATA" id="e22i4" d="M624,536 L624,546 L325,546 L325,775 L237,775 L237,785" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[4] → #16 · DATA</title></path><path class="edge CTRL" id="e23i1" d="M96,725 L96,889" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#23[1] → #8 · CTRL</title></path><path class="edge CTRL" id="e23i2" d="M216,725 L216,735 L126,735 L126,889" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#23[2] → #10 · CTRL</title></path><path class="edge CTRL" id="e25i0" d="M96,945 L96,1114" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#25[0] → #23 · CTRL</title></path><path class="edge MEM" id="e25i1" d="M167,1049 L167,1076 L126,1076 L126,1114" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#25[1] → #1 · MEM</title></path><path class="edge DATA" id="e25i2" d="M624,536 L624,1086 L156,1086 L156,1114" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[2] → #16 · DATA</title></path><path class="edge MEM" id="e224i1" d="M197,841 L197,851 L228,851 L228,889" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[1] → #22 · MEM</title></path><path class="edge MEM" id="e224i2" d="M209,432 L209,452 L336,452 L336,851 L268,851 L268,889" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[2] → #14 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(107,999)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e1i1" d="M84,118 L84,642 Q84,650 92,650 L387,650 Q395,650 395,658 L395,688" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M425,640 L425,688" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #224 · MEM</title></path><path class="edge MEM" id="e12i1" d="M84,118 L84,140 Q84,148 92,148 L242,148 Q250,148 250,156 L250,166" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#12[1] → #6 · MEM</title></path><path class="edge DATA" id="e12i2" d="M274,118 L274,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[2] → #9 · DATA</title></path><path class="edge DATA" id="e12i3" d="M426,118 L426,123 Q426,128 421,128 L306,128 Q298,128 298,136 L298,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[3] → #11 · DATA</title></path><path class="edge MEM" id="e14i1" d="M262,222 L262,227 Q262,232 267,232 L382,232 Q390,232 390,240 L390,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#14[1] → #12 · MEM</title></path><path class="edge DATA" id="e14i2" d="M414,222 L414,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge DATA" id="e14i3" d="M566,222 L566,227 Q566,232 561,232 L446,232 Q438,232 438,240 L438,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[3] → #4 · DATA</title></path><path class="edge MEM" id="e16i1" d="M402,326 L402,340 Q402,346 408,346 L408,346 Q414,346 414,352 L414,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#16[1] → #14 · MEM</title></path><path class="edge DATA" id="e16i2" d="M274,118 L274,130 Q274,138 282,138 L628,138 Q636,138 636,146 L636,328 Q636,336 628,336 L452,336 Q444,336 444,344 L444,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #9 · DATA</title></path><path class="edge CTRL" id="e22i0" d="M133,430 L133,480" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#22[0] → #8 · CTRL</title></path><path class="edge MEM" id="e22i1" d="M402,326 L402,338 Q402,346 394,346 L188,346 Q180,346 180,354 L180,432 Q180,440 172,440 L161,440 Q153,440 153,448 L153,480" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#22[1] → #14 · MEM</title></path><path class="edge DATA" id="e22i2" d="M274,118 L274,130 Q274,138 266,138 L199,138 Q191,138 191,146 L191,442 Q191,450 183,450 L181,450 Q173,450 173,458 L173,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #9 · DATA</title></path><path class="edge DATA" id="e22i3" d="M262,430 L262,452 Q262,460 254,460 L201,460 Q193,460 193,468 L193,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[3] → #21 · DATA</title></path><path class="edge DATA" id="e22i4" d="M414,430 L414,462 Q414,470 406,470 L218,470 Q213,470 213,475 L213,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[4] → #16 · DATA</title></path><path class="edge MEM" id="e25i1" d="M395,744 L395,749 Q395,754 400,754 L457,754 Q465,754 465,762 L465,792" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#25[1] → #1 · MEM</title></path><path class="edge DATA" id="e25i2" d="M414,430 L414,462 Q414,470 422,470 L487,470 Q495,470 495,478 L495,792" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[2] → #16 · DATA</title></path><path class="edge MEM" id="e224i1" d="M173,536 L173,541 Q173,546 178,546 L397,546 Q405,546 405,554 L405,584" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[1] → #22 · MEM</title></path><path class="edge MEM" id="e224i2" d="M402,326 L402,338 Q402,346 410,346 L476,346 Q484,346 484,354 L484,432 Q484,440 476,440 L453,440 Q445,440 445,448 L445,584" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#224[2] → #14 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(335,694)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
 Type not computed
 
-[0] → #23  CTRL
+[0] → —  CTRL
 [1] → #6  MEM
-[2] → #224  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(89,24)" style="opacity: 1;"><path class="box" d="M0,0H360V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="180" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="180"/><title>#2 Start
+[2] → #224  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(24,24)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#2 Start
 Type not computed
 
-</title></g><g class="node" id="n3" data-id="3" transform="translate(323.5,1218)" style="opacity: 1;"><path class="box" d="M0,0H72V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="36" y="17"><tspan>Stop</tspan><tspan class="node-id">  #3</tspan></text><text class="type" text-anchor="middle" y="35" x="36"/><title>#3 Stop
+</title></g><g class="node" id="n4" data-id="4" transform="translate(506,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
 Type not computed
 
-[0] → #25  CTRL</title><circle class="port" cx="36" cy="0" r="3" fill="#536477"/><text class="slot" x="36" y="-7" text-anchor="middle">0</text></g><g class="node" id="n4" data-id="4" transform="translate(464,278)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
-Type not computed
-
-</title></g><g class="node" id="n5" data-id="5" transform="translate(89,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 $ctrl
-Projection 0 of #2
-Type not computed
-
-[0] → #2  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(209,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
+</title></g><g class="node" id="n6" data-id="6" transform="translate(24,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
 Projection 1 of #2
 Type not computed
 
-[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(329,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
-Projection 2 of #2
-Type not computed
-
-[0] → #2  DATA</title></g><g class="node" id="n8" data-id="8" transform="translate(36,675)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 True
-Projection 0 of #17
+[0] → #2  MEM</title></g><g class="node" id="n8" data-id="8" transform="translate(95,398)" style="opacity: 1;"><path class="box" d="M0,0H75V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="37.5" y="17"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="37.5"/><title>#8 True
+Projection 0 of #0
 Type not computed
 
-[0] → #17  CTRL</title></g><g class="node" id="n9" data-id="9" transform="translate(171,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
+</title></g><g class="node" id="n9" data-id="9" transform="translate(214,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
 Type not computed
 
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(156,675)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #10/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 False
-Projection 1 of #17
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n11" data-id="11" transform="translate(366,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#2</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 #2
 Type not computed
 
-[0] → #17  CTRL</title></g><g class="node" id="n11" data-id="11" transform="translate(323,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#2</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 #2
+</title></g><g class="node" id="n12" data-id="12" transform="translate(202,172)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 .f =
 Type not computed
 
-</title></g><g class="node" id="n12" data-id="12" transform="translate(160,278)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 .f =
-Type not computed
-
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #6  MEM
 [2] → #9  DATA
-[3] → #11  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n13" data-id="13" transform="translate(312,278)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 new S
+[3] → #11  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n13" data-id="13" transform="translate(354,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 new S
 Type not computed
 
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n14" data-id="14" transform="translate(149,382)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 .f =
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n14" data-id="14" transform="translate(342,276)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 .f =
 Type not computed
 
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #12  MEM
 [2] → #13  DATA
-[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(564,486)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 .f
+[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(354,380)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 .f
 Type not computed
 
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #14  MEM
-[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n17" data-id="17" transform="translate(36,631)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #17</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#17 If
-Type not computed
-
-[0] → #5  CTRL
-[1] → #7  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n21" data-id="21" transform="translate(206,486)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 #1
+[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n21" data-id="21" transform="translate(202,380)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 #1
 Type not computed
 
-</title></g><g class="node" id="n22" data-id="22" transform="translate(137,791)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 .f =
+</title></g><g class="node" id="n22" data-id="22" transform="translate(113,486)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 .f =
 Type not computed
 
 [0] → #8  CTRL
 [1] → #14  MEM
 [2] → #9  DATA
 [3] → #21  DATA
-[4] → #16  DATA</title><circle class="port" cx="20" cy="-3" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="100" cy="-3" r="3" fill="#536477"/><text class="slot" x="20" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="60" y="-10" text-anchor="middle">2</text><text class="slot" x="80" y="-10" text-anchor="middle">3</text><text class="slot" x="100" y="-10" text-anchor="middle">4</text></g><g class="node" id="n23" data-id="23" transform="translate(36,895)" style="opacity: 1;"><path class="box" d="M12,0H108L120,44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Region</tspan><tspan class="node-id">  #23</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#23 Region
-Type not computed
-
-[0] → —  DATA
-[1] → #8  CTRL
-[2] → #10  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n25" data-id="25" transform="translate(66,1120)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#25 Return
+[4] → #16  DATA</title><circle class="port" cx="20" cy="-3" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="100" cy="-3" r="3" fill="#536477"/><text class="slot" x="20" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="60" y="-10" text-anchor="middle">2</text><text class="slot" x="80" y="-10" text-anchor="middle">3</text><text class="slot" x="100" y="-10" text-anchor="middle">4</text></g><g class="node" id="n25" data-id="25" transform="translate(405,798)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#25 Return
 Type not computed
 
-[0] → #23  CTRL
+[0] → —  CTRL
 [1] → #1  MEM
-[2] → #16  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n224" data-id="224" transform="translate(188,895)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #224</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#224 MemPhi_2
+[2] → #16  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n224" data-id="224" transform="translate(365,590)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #224</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#224 MemPhi_2
 Type not computed
 
-[0] → #23  ASSOC
+[0] → —  ASSOC
 [1] → #22  MEM
-[2] → #14  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #23</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(24,591)"><text class="label" x="26" y="17"><tspan>If</tspan><tspan class="node-id">  #17</tspan></text><title>If · 7 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #17"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g></g><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
+[2] → #14  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"/><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
diff --git a/chapter11/docs/graph4.json b/chapter11/docs/graph4.json
index b021c03f..44c1c055 100644
--- a/chapter11/docs/graph4.json
+++ b/chapter11/docs/graph4.json
@@ -2,41 +2,23 @@
   "ver": 1,
   "comp": "chapter11/docs/graph4.svg",
   "step": 1,
-  "roots": [],
+  "roots": [37],
   "scope": 0,
   "nodes": [
     {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null},
     {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
-    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 37, "role": "CTRL", "label": null}], "proj": null},
     {"id": 4, "label": "#0", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 5, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
     {"id": 6, "label": "$mem", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 2, "role": "MEM", "label": null}], "proj": {"par": 2, "idx": 1}},
     {"id": 7, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 2}},
-    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 16, "role": "CTRL", "label": null}], "proj": {"par": 16, "idx": 0}},
-    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
     {"id": 10, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
-    {"id": 11, "label": "Loop", "type": null, "kind": "LOOP", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 5, "role": "CTRL", "label": null}, {"idx": 2, "def": 32, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 12, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 16, "role": "CTRL", "label": null}], "proj": {"par": 16, "idx": 1}},
-    {"id": 13, "label": "φ_arg", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 11, "role": "ASSOC", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 35, "role": "DATA", "label": null}], "proj": null},
-    {"id": 14, "label": "<", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 4, "role": "DATA", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}], "proj": null},
-    {"id": 15, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": {"par": 25, "idx": 0}},
-    {"id": 16, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "DATA", "label": null}], "proj": null},
-    {"id": 17, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": {"par": 25, "idx": 1}},
     {"id": 21, "label": "//", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 22, "role": "DATA", "label": null}], "proj": null},
     {"id": 22, "label": "#3", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 23, "label": "==", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 13, "role": "DATA", "label": null}, {"idx": 2, "def": 24, "role": "DATA", "label": null}], "proj": null},
-    {"id": 24, "label": "#5", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 25, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 8, "role": "CTRL", "label": null}, {"idx": 1, "def": 23, "role": "DATA", "label": null}], "proj": null},
     {"id": 31, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 230, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}], "proj": null},
-    {"id": 32, "label": "Region", "type": null, "kind": "REGION", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 15, "role": "CTRL", "label": null}, {"idx": 2, "def": 17, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 35, "label": "-", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 13, "role": "DATA", "label": null}, {"idx": 2, "def": 36, "role": "DATA", "label": null}], "proj": null},
-    {"id": 36, "label": "#1", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 37, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 12, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
-    {"id": 230, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 11, "role": "ASSOC", "label": null}, {"idx": 1, "def": 10, "role": "MEM", "label": null}, {"idx": 2, "def": 233, "role": "MEM", "label": null}], "proj": null},
-    {"id": 233, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 32, "role": "ASSOC", "label": null}, {"idx": 1, "def": 31, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null}
+    {"id": 37, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
+    {"id": 230, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 10, "role": "MEM", "label": null}, {"idx": 2, "def": 233, "role": "MEM", "label": null}], "proj": null},
+    {"id": 233, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 31, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null}
   ],
   "groups": [
-    {"id": 11, "par": 0, "nodes": [8, 10, 11, 12, 13, 14, 16, 35, 230]},
-    {"id": 25, "par": 11, "nodes": [15, 17, 21, 23, 25, 31, 32, 233]}
   ]
 }
diff --git a/chapter11/docs/graph4.svg b/chapter11/docs/graph4.svg
index c268b4e9..9ca92879 100644
--- a/chapter11/docs/graph4.svg
+++ b/chapter11/docs/graph4.svg
@@ -1,4 +1,4 @@
-<svg aria-label="Compiler graph" width="890" height="1532" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 890 1532" style="font-family: sans-serif;"><style>
+<svg aria-label="Compiler graph" width="780" height="568" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 780 568" style="font-family: sans-serif;"><style>
     html, body { height:100%; margin:0; font-family:sans-serif; }
     .viewer { height:100%; display:grid; grid-template-rows:auto minmax(0,1fr) auto; }
     .source { padding:8px; border-bottom:1px solid #ccc; }
@@ -60,128 +60,61 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(41,277)"><rect class="region-box" rx="8" width="803" height="944" fill="#f1f6fc"/></g><g class="region" transform="translate(276,800)"><rect class="region-box" rx="8" width="503" height="374" fill="#f2f7ef"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e1i1" d="M275,118 L275,128 L854,128 L854,1236 L795,1236 L795,1274" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M459,495 L459,505 L789,505 L789,1246 L825,1246 L825,1274" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #230 · MEM</title></path><path class="edge CTRL" id="e3i0" d="M285,1431 C285,1455 445,1458 445,1482" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #37 · CTRL</title></path><path class="edge CTRL" id="e9i0" d="M155,118 L155,148 L530,148 L530,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#9[0] → #5 · CTRL</title></path><path class="edge MEM" id="e10i1" d="M275,118 L275,128 L307,128 L307,262 L427,262 L427,335" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#10[1] → #6 · MEM</title></path><path class="edge DATA" id="e10i2" d="M530,222 L530,232 L451,232 L451,335" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[2] → #9 · DATA</title></path><path class="edge DATA" id="e10i3" d="M237,222 L237,252 L475,252 L475,335" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[3] → #4 · DATA</title></path><path class="edge CTRL" id="e11i1" d="M155,118 L155,439" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#11[1] → #5 · CTRL</title></path><path class="edge CTRL" id="e11i2" d="M438,1139 L438,1149 L832,1149 L832,414 L185,414 L185,442" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#11[2] → #32 · CTRL</title></path><path class="edge DATA" id="e13i1" d="M395,118 L395,138 L166,138 L166,262 L287,262 L287,439" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[1] → #7 · DATA</title></path><path class="edge DATA" id="e13i2" d="M378,596 L378,606 L822,606 L822,422 L327,422 L327,442" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[2] → #35 · DATA</title></path><path class="edge DATA" id="e14i1" d="M237,222 L237,252 L73,252 L73,515 L226,515 L226,543" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[1] → #4 · DATA</title></path><path class="edge DATA" id="e14i2" d="M307,495 L307,515 L256,515 L256,543" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge CTRL" id="e16i0" d="M155,495 L155,647" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#16[0] → #11 · CTRL</title></path><path class="edge DATA" id="e16i1" d="M226,599 L226,609 L235,609 L235,647" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[1] → #14 · DATA</title></path><path class="edge DATA" id="e21i1" d="M395,118 L395,138 L655,138 L655,242 L696,242 L696,834" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[1] → #7 · DATA</title></path><path class="edge DATA" id="e21i2" d="M726,222 L726,834" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[2] → #22 · DATA</title></path><path class="edge DATA" id="e23i1" d="M307,495 L307,515 L448,515 L448,834" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#23[1] → #13 · DATA</title></path><path class="edge DATA" id="e23i2" d="M378,222 L378,242 L539,242 L539,757 L478,757 L478,834" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#23[2] → #24 · DATA</title></path><path class="edge CTRL" id="e25i0" d="M135,747 L135,757 L368,757 L368,938" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#25[0] → #8 · CTRL</title></path><path class="edge DATA" id="e25i1" d="M448,890 L448,938" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[1] → #23 · DATA</title></path><path class="edge MEM" id="e31i1" d="M459,495 L459,505 L614,505 L614,949" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#31[1] → #230 · MEM</title></path><path class="edge DATA" id="e31i2" d="M530,222 L530,232 L625,232 L625,900 L638,900 L638,949" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[2] → #9 · DATA</title></path><path class="edge DATA" id="e31i3" d="M696,890 L696,900 L662,900 L662,949" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[3] → #21 · DATA</title></path><path class="edge CTRL" id="e32i1" d="M348,1038 L348,1048 L438,1048 L438,1086" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#32[1] → #15 · CTRL</title></path><path class="edge CTRL" id="e32i2" d="M468,1038 L468,1086" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#32[2] → #17 · CTRL</title></path><path class="edge DATA" id="e35i1" d="M307,495 L307,515 L378,515 L378,543" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#35[1] → #13 · DATA</title></path><path class="edge DATA" id="e35i2" d="M84,222 L84,505 L408,505 L408,543" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#35[2] → #36 · DATA</title></path><path class="edge CTRL" id="e37i0" d="M255,747 L255,1378" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#37[0] → #12 · CTRL</title></path><path class="edge MEM" id="e37i1" d="M795,1330 L795,1340 L285,1340 L285,1378" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#37[1] → #1 · MEM</title></path><path class="edge DATA" id="e37i2" d="M530,222 L530,232 L865,232 L865,1350 L315,1350 L315,1378" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#37[2] → #9 · DATA</title></path><path class="edge MEM" id="e230i1" d="M439,391 L439,439" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[1] → #10 · MEM</title></path><path class="edge MEM" id="e230i2" d="M590,1139 L590,1149 L812,1149 L812,430 L479,430 L479,442" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[2] → #233 · MEM</title></path><path class="edge MEM" id="e233i1" d="M626,1005 L626,1048 L570,1048 L570,1086" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[1] → #31 · MEM</title></path><path class="edge MEM" id="e233i2" d="M459,495 L459,505 L789,505 L789,757 L766,757 L766,1058 L610,1058 L610,1086" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[2] → #230 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(735,1280)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e1i1" d="M266,118 L266,123 Q266,128 261,128 L193,128 Q185,128 185,136 L185,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M259,326 L259,338 Q259,346 251,346 L223,346 Q215,346 215,354 L215,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #230 · MEM</title></path><path class="edge MEM" id="e10i1" d="M266,118 L266,123 Q266,128 261,128 L252,128 Q244,128 244,136 L244,166" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#10[1] → #6 · MEM</title></path><path class="edge DATA" id="e10i2" d="M114,118 L114,130 Q114,138 122,138 L260,138 Q268,138 268,146 L268,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[2] → #9 · DATA</title></path><path class="edge DATA" id="e10i3" d="M544,118 L544,123 Q544,128 539,128 L300,128 Q292,128 292,136 L292,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[3] → #4 · DATA</title></path><path class="edge DATA" id="e21i1" d="M386,118 L386,130 Q386,138 394,138 L400,138 Q408,138 408,146 L408,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[1] → #7 · DATA</title></path><path class="edge DATA" id="e21i2" d="M696,118 L696,130 Q696,138 688,138 L446,138 Q438,138 438,146 L438,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[2] → #22 · DATA</title></path><path class="edge MEM" id="e31i1" d="M259,326 L259,338 Q259,346 267,346 L306,346 Q314,346 314,354 L314,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#31[1] → #230 · MEM</title></path><path class="edge DATA" id="e31i2" d="M114,118 L114,328 Q114,336 122,336 L330,336 Q338,336 338,344 L338,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[2] → #9 · DATA</title></path><path class="edge DATA" id="e31i3" d="M408,222 L408,328 Q408,336 400,336 L370,336 Q362,336 362,344 L362,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[3] → #21 · DATA</title></path><path class="edge MEM" id="e37i1" d="M185,430 L185,435 Q185,440 180,440 L92,440 Q84,440 84,448 L84,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#37[1] → #1 · MEM</title></path><path class="edge DATA" id="e37i2" d="M114,118 L114,478" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#37[2] → #9 · DATA</title></path><path class="edge MEM" id="e230i1" d="M256,222 L256,227 Q256,232 251,232 L247,232 Q239,232 239,240 L239,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[1] → #10 · MEM</title></path><path class="edge MEM" id="e230i2" d="M326,534 L326,539 Q326,544 331,544 L388,544 Q396,544 396,536 L396,240 Q396,232 388,232 L287,232 Q279,232 279,240 L279,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[2] → #233 · MEM</title></path><path class="edge MEM" id="e233i1" d="M326,430 L326,435 Q326,440 321,440 L314,440 Q306,440 306,448 L306,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[1] → #31 · MEM</title></path><path class="edge MEM" id="e233i2" d="M259,326 L259,344 Q259,346 257,346 L257,346 Q255,346 255,348 L255,442 Q255,450 263,450 L338,450 Q346,450 346,458 L346,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[2] → #230 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(125,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
 Type not computed
 
 [0] → —  DATA
 [1] → #6  MEM
-[2] → #230  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(95,24)" style="opacity: 1;"><path class="box" d="M0,0H360V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="180" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="180"/><title>#2 Start
+[2] → #230  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(206,24)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#2 Start
 Type not computed
 
-</title></g><g class="node" id="n3" data-id="3" transform="translate(409,1482)" style="opacity: 1;"><path class="box" d="M0,0H72V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="36" y="17"><tspan>Stop</tspan><tspan class="node-id">  #3</tspan></text><text class="type" text-anchor="middle" y="35" x="36"/><title>#3 Stop
+</title></g><g class="node" id="n4" data-id="4" transform="translate(484,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
 Type not computed
 
-[0] → #37  CTRL</title><circle class="port" cx="36" cy="0" r="3" fill="#536477"/><text class="slot" x="36" y="-7" text-anchor="middle">0</text></g><g class="node" id="n4" data-id="4" transform="translate(177,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
-Type not computed
-
-</title></g><g class="node" id="n5" data-id="5" transform="translate(95,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 $ctrl
-Projection 0 of #2
-Type not computed
-
-[0] → #2  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(215,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
+</title></g><g class="node" id="n6" data-id="6" transform="translate(206,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
 Projection 1 of #2
 Type not computed
 
-[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(335,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
+[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(326,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
 Projection 2 of #2
 Type not computed
 
-[0] → #2  DATA</title></g><g class="node" id="n8" data-id="8" transform="translate(75,697)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 True
-Projection 0 of #16
-Type not computed
-
-[0] → #16  CTRL</title></g><g class="node" id="n9" data-id="9" transform="translate(470,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
+[0] → #2  DATA</title></g><g class="node" id="n9" data-id="9" transform="translate(54,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
 Type not computed
 
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(379,341)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 .f =
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(196,172)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 .f =
 Type not computed
 
 [0] → —  DATA
 [1] → #6  MEM
 [2] → #9  DATA
-[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n11" data-id="11" transform="translate(95,445)" style="opacity: 1;"><path class="box" d="M20,0H100Q120,0 120,20V24Q120,44 100,44H20Q0,44 0,24V20Q0,0 20,0Z" fill="#ffe0ab"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Loop</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 Loop
-Type not computed
-
-[0] → —  DATA
-[1] → #5  CTRL
-[2] → #32  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n12" data-id="12" transform="translate(195,697)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #12/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 False
-Projection 1 of #16
-Type not computed
-
-[0] → #16  CTRL</title></g><g class="node" id="n13" data-id="13" transform="translate(247,445)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>φ_arg</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 φ_arg
-Type not computed
-
-[0] → #11  ASSOC
-[1] → #7  DATA
-[2] → #35  DATA</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #11</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n14" data-id="14" transform="translate(166,549)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>&lt;</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 &lt;
-Type not computed
-
-[0] → —  DATA
-[1] → #4  DATA
-[2] → #13  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n15" data-id="15" transform="translate(288,988)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #15/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#15 True
-Projection 0 of #25
-Type not computed
-
-[0] → #25  CTRL</title></g><g class="node" id="n16" data-id="16" transform="translate(75,653)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#16 If
-Type not computed
-
-[0] → #11  CTRL
-[1] → #14  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n17" data-id="17" transform="translate(408,988)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #17/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#17 False
-Projection 1 of #25
-Type not computed
-
-[0] → #25  CTRL</title></g><g class="node" id="n21" data-id="21" transform="translate(636,840)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>//</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 //
+[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n21" data-id="21" transform="translate(348,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>//</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 //
 Type not computed
 
 [0] → —  DATA
 [1] → #7  DATA
-[2] → #22  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n22" data-id="22" transform="translate(666,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#3</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 #3
+[2] → #22  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n22" data-id="22" transform="translate(636,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#3</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 #3
 Type not computed
 
-</title></g><g class="node" id="n23" data-id="23" transform="translate(388,840)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>==</tspan><tspan class="node-id">  #23</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#23 ==
-Type not computed
-
-[0] → —  DATA
-[1] → #13  DATA
-[2] → #24  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n24" data-id="24" transform="translate(318,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#5</tspan><tspan class="node-id">  #24</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#24 #5
-Type not computed
-
-</title></g><g class="node" id="n25" data-id="25" transform="translate(288,944)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#25 If
-Type not computed
-
-[0] → #8  CTRL
-[1] → #23  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n31" data-id="31" transform="translate(566,955)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #31</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#31 .f =
+</title></g><g class="node" id="n31" data-id="31" transform="translate(266,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #31</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#31 .f =
 Type not computed
 
 [0] → —  DATA
 [1] → #230  MEM
 [2] → #9  DATA
-[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n32" data-id="32" transform="translate(378,1092)" style="opacity: 1;"><path class="box" d="M12,0H108L120,44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Region</tspan><tspan class="node-id">  #32</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#32 Region
-Type not computed
-
-[0] → —  DATA
-[1] → #15  CTRL
-[2] → #17  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n35" data-id="35" transform="translate(318,549)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>-</tspan><tspan class="node-id">  #35</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#35 -
-Type not computed
-
-[0] → —  DATA
-[1] → #13  DATA
-[2] → #36  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n36" data-id="36" transform="translate(24,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #36</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#36 #1
-Type not computed
-
-</title></g><g class="node" id="n37" data-id="37" transform="translate(225,1384)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #37</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#37 Return
+[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n37" data-id="37" transform="translate(24,484)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #37</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#37 Return
 Type not computed
 
-[0] → #12  CTRL
+[0] → —  CTRL
 [1] → #1  MEM
-[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n230" data-id="230" transform="translate(399,445)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #230</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#230 MemPhi_2
+[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n230" data-id="230" transform="translate(199,276)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #230</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#230 MemPhi_2
 Type not computed
 
-[0] → #11  ASSOC
+[0] → —  ASSOC
 [1] → #10  MEM
-[2] → #233  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #11</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n233" data-id="233" transform="translate(530,1092)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #233</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#233 MemPhi_2
+[2] → #233  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n233" data-id="233" transform="translate(266,484)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #233</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#233 MemPhi_2
 Type not computed
 
-[0] → #32  ASSOC
+[0] → —  ASSOC
 [1] → #31  MEM
-[2] → #230  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #32</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(41,277)"><text class="label" x="26" y="17"><tspan>Loop</tspan><tspan class="node-id">  #11</tspan></text><title>Loop · 17 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #11"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g><g class="region-head" transform="translate(276,800)"><text class="label" x="26" y="17"><tspan>If</tspan><tspan class="node-id">  #25</tspan></text><title>If · 8 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #25"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g></g><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
+[2] → #230  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"/><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
diff --git a/chapter11/docs/graph5.json b/chapter11/docs/graph5.json
index 2211cb19..659384e0 100644
--- a/chapter11/docs/graph5.json
+++ b/chapter11/docs/graph5.json
@@ -2,41 +2,23 @@
   "ver": 1,
   "comp": "chapter11/docs/graph5.svg",
   "step": 1,
-  "roots": [],
+  "roots": [37],
   "scope": 0,
   "nodes": [
-    {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null},
+    {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null},
     {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
-    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 37, "role": "CTRL", "label": null}], "proj": null},
     {"id": 4, "label": "#0", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 5, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
     {"id": 6, "label": "$mem", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 2, "role": "MEM", "label": null}], "proj": {"par": 2, "idx": 1}},
     {"id": 7, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 2}},
-    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 16, "role": "CTRL", "label": null}], "proj": {"par": 16, "idx": 0}},
-    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 10, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
-    {"id": 11, "label": "Loop", "type": null, "kind": "LOOP", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 5, "role": "CTRL", "label": null}, {"idx": 2, "def": 32, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 12, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 16, "role": "CTRL", "label": null}], "proj": {"par": 16, "idx": 1}},
-    {"id": 13, "label": "φ_arg", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 11, "role": "ASSOC", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 35, "role": "DATA", "label": null}], "proj": null},
-    {"id": 14, "label": "<", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 4, "role": "DATA", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}], "proj": null},
-    {"id": 15, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": {"par": 25, "idx": 0}},
-    {"id": 16, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "DATA", "label": null}], "proj": null},
-    {"id": 17, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": {"par": 25, "idx": 1}},
-    {"id": 21, "label": "//", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 22, "role": "DATA", "label": null}], "proj": null},
+    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 10, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
+    {"id": 21, "label": "//", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 22, "role": "DATA", "label": null}], "proj": null},
     {"id": 22, "label": "#3", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 23, "label": "==", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 13, "role": "DATA", "label": null}, {"idx": 2, "def": 24, "role": "DATA", "label": null}], "proj": null},
-    {"id": 24, "label": "#5", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 25, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 8, "role": "CTRL", "label": null}, {"idx": 1, "def": 23, "role": "DATA", "label": null}], "proj": null},
-    {"id": 31, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 230, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}], "proj": null},
-    {"id": 32, "label": "Region", "type": null, "kind": "REGION", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 15, "role": "CTRL", "label": null}, {"idx": 2, "def": 17, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 35, "label": "-", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 13, "role": "DATA", "label": null}, {"idx": 2, "def": 36, "role": "DATA", "label": null}], "proj": null},
-    {"id": 36, "label": "#1", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 37, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 12, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
-    {"id": 230, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 11, "role": "ASSOC", "label": null}, {"idx": 1, "def": 10, "role": "MEM", "label": null}, {"idx": 2, "def": 233, "role": "MEM", "label": null}], "proj": null},
-    {"id": 233, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 32, "role": "ASSOC", "label": null}, {"idx": 1, "def": 31, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null}
+    {"id": 31, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 230, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}], "proj": null},
+    {"id": 37, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
+    {"id": 230, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 10, "role": "MEM", "label": null}, {"idx": 2, "def": 233, "role": "MEM", "label": null}], "proj": null},
+    {"id": 233, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 31, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null}
   ],
   "groups": [
-    {"id": 11, "par": 0, "nodes": [1, 8, 11, 12, 13, 14, 16, 23, 31, 35, 230]},
-    {"id": 25, "par": 11, "nodes": [15, 17, 25, 32, 233]}
   ]
 }
diff --git a/chapter11/docs/graph5.svg b/chapter11/docs/graph5.svg
index 1669e008..c120550f 100644
--- a/chapter11/docs/graph5.svg
+++ b/chapter11/docs/graph5.svg
@@ -1,4 +1,4 @@
-<svg aria-label="Compiler graph" width="1045" height="1366" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1045 1366" style="font-family: sans-serif;"><style>
+<svg aria-label="Compiler graph" width="780" height="568" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 780 568" style="font-family: sans-serif;"><style>
     html, body { height:100%; margin:0; font-family:sans-serif; }
     .viewer { height:100%; display:grid; grid-template-rows:auto minmax(0,1fr) auto; }
     .source { padding:8px; border-bottom:1px solid #ccc; }
@@ -60,128 +60,61 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(24,379)"><rect class="region-box" rx="8" width="951" height="780" fill="#f1f6fc"/></g><g class="region" transform="translate(243,862)"><rect class="region-box" rx="8" width="360" height="250" fill="#f2f7ef"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e1i0" d="M513,533 L513,593 L706,593 L706,603" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#1[0] → #11 · CTRL</title></path><path class="edge MEM" id="e1i1" d="M655,118 L655,128 L991,128 L991,336 L920,336 L920,593 L736,593 L736,603" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M817,533 L817,573 L766,573 L766,603" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #230 · MEM</title></path><path class="edge CTRL" id="e3i0" d="M643,1265 C643,1289 522.5,1292 522.5,1316" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #37 · CTRL</title></path><path class="edge CTRL" id="e9i0" d="M535,118 L535,148 L769,148 L769,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#9[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e10i0" d="M535,118 L535,242 L559,242 L559,270" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#10[0] → #5 · CTRL</title></path><path class="edge MEM" id="e10i1" d="M655,118 L655,128 L546,128 L546,232 L583,232 L583,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#10[1] → #6 · MEM</title></path><path class="edge DATA" id="e10i2" d="M769,222 L769,232 L607,232 L607,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[2] → #9 · DATA</title></path><path class="edge DATA" id="e10i3" d="M617,222 L617,252 L631,252 L631,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[3] → #4 · DATA</title></path><path class="edge CTRL" id="e11i1" d="M535,118 L535,148 L513,148 L513,477" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#11[1] → #5 · CTRL</title></path><path class="edge CTRL" id="e11i2" d="M379,1097 L379,1107 L963,1107 L963,452 L543,452 L543,480" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#11[2] → #32 · CTRL</title></path><path class="edge DATA" id="e13i1" d="M775,118 L775,138 L524,138 L524,356 L645,356 L645,477" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[1] → #7 · DATA</title></path><path class="edge DATA" id="e13i2" d="M128,656 L128,666 L953,666 L953,460 L685,460 L685,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[2] → #35 · DATA</title></path><path class="edge CTRL" id="e14i0" d="M513,533 L513,593 L554,593 L554,603" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#14[0] → #11 · CTRL</title></path><path class="edge DATA" id="e14i1" d="M617,222 L617,252 L909,252 L909,583 L584,583 L584,603" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[1] → #4 · DATA</title></path><path class="edge DATA" id="e14i2" d="M665,533 L665,543 L614,543 L614,603" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge CTRL" id="e16i0" d="M513,533 L513,707" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#16[0] → #11 · CTRL</title></path><path class="edge DATA" id="e16i1" d="M584,659 L584,669 L593,669 L593,707" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[1] → #14 · DATA</title></path><path class="edge CTRL" id="e21i0" d="M841,46 L891,46 L891,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[0] → #2 · CTRL</title></path><path class="edge DATA" id="e21i1" d="M775,118 L775,138 L921,138 L921,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[1] → #7 · DATA</title></path><path class="edge DATA" id="e21i2" d="M961,118 L961,138 L951,138 L951,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[2] → #22 · DATA</title></path><path class="edge CTRL" id="e23i0" d="M513,533 L513,593 L250,593 L250,603" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#23[0] → #11 · CTRL</title></path><path class="edge DATA" id="e23i1" d="M665,533 L665,543 L280,543 L280,603" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#23[1] → #13 · DATA</title></path><path class="edge DATA" id="e23i2" d="M310,326 L310,603" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#23[2] → #24 · DATA</title></path><path class="edge CTRL" id="e25i0" d="M493,807 L493,837 L335,837 L335,896" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#25[0] → #8 · CTRL</title></path><path class="edge DATA" id="e25i1" d="M280,659 L280,847 L415,847 L415,896" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[1] → #23 · DATA</title></path><path class="edge CTRL" id="e31i0" d="M513,533 L513,593 L396,593 L396,603" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#31[0] → #11 · CTRL</title></path><path class="edge MEM" id="e31i1" d="M817,533 L817,573 L420,573 L420,603" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#31[1] → #230 · MEM</title></path><path class="edge DATA" id="e31i2" d="M769,222 L769,336 L887,336 L887,553 L444,553 L444,603" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[2] → #9 · DATA</title></path><path class="edge DATA" id="e31i3" d="M921,222 L921,242 L898,242 L898,563 L468,563 L468,603" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[3] → #21 · DATA</title></path><path class="edge CTRL" id="e32i1" d="M315,996 L315,1006 L379,1006 L379,1044" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#32[1] → #15 · CTRL</title></path><path class="edge CTRL" id="e32i2" d="M435,996 L435,1006 L409,1006 L409,1044" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#32[2] → #17 · CTRL</title></path><path class="edge CTRL" id="e35i0" d="M513,533 L513,593 L98,593 L98,603" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#35[0] → #11 · CTRL</title></path><path class="edge DATA" id="e35i1" d="M665,533 L665,543 L128,543 L128,603" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#35[1] → #13 · DATA</title></path><path class="edge DATA" id="e35i2" d="M158,326 L158,603" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#35[2] → #36 · DATA</title></path><path class="edge CTRL" id="e37i0" d="M613,807 L613,1212" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#37[0] → #12 · CTRL</title></path><path class="edge MEM" id="e37i1" d="M736,659 L736,1174 L643,1174 L643,1212" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#37[1] → #1 · MEM</title></path><path class="edge DATA" id="e37i2" d="M769,222 L769,232 L1002,232 L1002,1184 L673,1184 L673,1212" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#37[2] → #9 · DATA</title></path><path class="edge MEM" id="e230i1" d="M595,326 L595,346 L797,346 L797,477" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[1] → #10 · MEM</title></path><path class="edge MEM" id="e230i2" d="M531,1097 L531,1107 L943,1107 L943,468 L837,468 L837,480" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[2] → #233 · MEM</title></path><path class="edge MEM" id="e233i1" d="M432,659 L432,669 L411,669 L411,827 L511,827 L511,1044" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[1] → #31 · MEM</title></path><path class="edge MEM" id="e233i2" d="M817,533 L817,573 L502,573 L502,679 L422,679 L422,817 L551,817 L551,1044" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[2] → #230 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(676,609)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e1i1" d="M266,118 L266,123 Q266,128 261,128 L193,128 Q185,128 185,136 L185,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M259,326 L259,338 Q259,346 251,346 L223,346 Q215,346 215,354 L215,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #230 · MEM</title></path><path class="edge MEM" id="e10i1" d="M266,118 L266,123 Q266,128 261,128 L252,128 Q244,128 244,136 L244,166" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#10[1] → #6 · MEM</title></path><path class="edge DATA" id="e10i2" d="M114,118 L114,130 Q114,138 122,138 L260,138 Q268,138 268,146 L268,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[2] → #9 · DATA</title></path><path class="edge DATA" id="e10i3" d="M544,118 L544,123 Q544,128 539,128 L300,128 Q292,128 292,136 L292,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[3] → #4 · DATA</title></path><path class="edge DATA" id="e21i1" d="M386,118 L386,130 Q386,138 394,138 L400,138 Q408,138 408,146 L408,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[1] → #7 · DATA</title></path><path class="edge DATA" id="e21i2" d="M696,118 L696,130 Q696,138 688,138 L446,138 Q438,138 438,146 L438,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[2] → #22 · DATA</title></path><path class="edge MEM" id="e31i1" d="M259,326 L259,338 Q259,346 267,346 L306,346 Q314,346 314,354 L314,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#31[1] → #230 · MEM</title></path><path class="edge DATA" id="e31i2" d="M114,118 L114,328 Q114,336 122,336 L330,336 Q338,336 338,344 L338,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[2] → #9 · DATA</title></path><path class="edge DATA" id="e31i3" d="M408,222 L408,328 Q408,336 400,336 L370,336 Q362,336 362,344 L362,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[3] → #21 · DATA</title></path><path class="edge MEM" id="e37i1" d="M185,430 L185,435 Q185,440 180,440 L92,440 Q84,440 84,448 L84,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#37[1] → #1 · MEM</title></path><path class="edge DATA" id="e37i2" d="M114,118 L114,478" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#37[2] → #9 · DATA</title></path><path class="edge MEM" id="e230i1" d="M256,222 L256,227 Q256,232 251,232 L247,232 Q239,232 239,240 L239,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[1] → #10 · MEM</title></path><path class="edge MEM" id="e230i2" d="M326,534 L326,539 Q326,544 331,544 L388,544 Q396,544 396,536 L396,240 Q396,232 388,232 L287,232 Q279,232 279,240 L279,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[2] → #233 · MEM</title></path><path class="edge MEM" id="e233i1" d="M326,430 L326,435 Q326,440 321,440 L314,440 Q306,440 306,448 L306,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[1] → #31 · MEM</title></path><path class="edge MEM" id="e233i2" d="M259,326 L259,344 Q259,346 257,346 L257,346 Q255,346 255,348 L255,442 Q255,450 263,450 L338,450 Q346,450 346,458 L346,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[2] → #230 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(125,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
 Type not computed
 
-[0] → #11  CTRL
+[0] → —  CTRL
 [1] → #6  MEM
-[2] → #230  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(475,24)" style="opacity: 1;"><path class="box" d="M0,0H360V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="180" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="180"/><title>#2 Start
+[2] → #230  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(206,24)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#2 Start
 Type not computed
 
-</title></g><g class="node" id="n3" data-id="3" transform="translate(486.5,1316)" style="opacity: 1;"><path class="box" d="M0,0H72V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="36" y="17"><tspan>Stop</tspan><tspan class="node-id">  #3</tspan></text><text class="type" text-anchor="middle" y="35" x="36"/><title>#3 Stop
+</title></g><g class="node" id="n4" data-id="4" transform="translate(484,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
 Type not computed
 
-[0] → #37  CTRL</title><circle class="port" cx="36" cy="0" r="3" fill="#536477"/><text class="slot" x="36" y="-7" text-anchor="middle">0</text></g><g class="node" id="n4" data-id="4" transform="translate(557,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
-Type not computed
-
-</title></g><g class="node" id="n5" data-id="5" transform="translate(475,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 $ctrl
-Projection 0 of #2
-Type not computed
-
-[0] → #2  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(595,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
+</title></g><g class="node" id="n6" data-id="6" transform="translate(206,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
 Projection 1 of #2
 Type not computed
 
-[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(715,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
+[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(326,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
 Projection 2 of #2
 Type not computed
 
-[0] → #2  DATA</title></g><g class="node" id="n8" data-id="8" transform="translate(433,757)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 True
-Projection 0 of #16
+[0] → #2  DATA</title></g><g class="node" id="n9" data-id="9" transform="translate(54,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
 Type not computed
 
-[0] → #16  CTRL</title></g><g class="node" id="n9" data-id="9" transform="translate(709,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(196,172)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 .f =
 Type not computed
 
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(535,276)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 .f =
-Type not computed
-
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #6  MEM
 [2] → #9  DATA
-[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n11" data-id="11" transform="translate(453,483)" style="opacity: 1;"><path class="box" d="M20,0H100Q120,0 120,20V24Q120,44 100,44H20Q0,44 0,24V20Q0,0 20,0Z" fill="#ffe0ab"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Loop</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 Loop
-Type not computed
-
-[0] → —  DATA
-[1] → #5  CTRL
-[2] → #32  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n12" data-id="12" transform="translate(553,757)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #12/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 False
-Projection 1 of #16
+[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n21" data-id="21" transform="translate(348,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>//</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 //
 Type not computed
 
-[0] → #16  CTRL</title></g><g class="node" id="n13" data-id="13" transform="translate(605,483)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>φ_arg</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 φ_arg
-Type not computed
-
-[0] → #11  ASSOC
+[0] → —  CTRL
 [1] → #7  DATA
-[2] → #35  DATA</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #11</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n14" data-id="14" transform="translate(524,609)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>&lt;</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 &lt;
-Type not computed
-
-[0] → #11  CTRL
-[1] → #4  DATA
-[2] → #13  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n15" data-id="15" transform="translate(255,946)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #15/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#15 True
-Projection 0 of #25
-Type not computed
-
-[0] → #25  CTRL</title></g><g class="node" id="n16" data-id="16" transform="translate(433,713)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#16 If
-Type not computed
-
-[0] → #11  CTRL
-[1] → #14  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n17" data-id="17" transform="translate(375,946)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #17/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#17 False
-Projection 1 of #25
+[2] → #22  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n22" data-id="22" transform="translate(636,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#3</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 #3
 Type not computed
 
-[0] → #25  CTRL</title></g><g class="node" id="n21" data-id="21" transform="translate(861,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>//</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 //
+</title></g><g class="node" id="n31" data-id="31" transform="translate(266,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #31</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#31 .f =
 Type not computed
 
-[0] → #2  CTRL
-[1] → #7  DATA
-[2] → #22  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n22" data-id="22" transform="translate(901,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#3</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 #3
-Type not computed
-
-</title></g><g class="node" id="n23" data-id="23" transform="translate(220,609)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>==</tspan><tspan class="node-id">  #23</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#23 ==
-Type not computed
-
-[0] → #11  CTRL
-[1] → #13  DATA
-[2] → #24  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n24" data-id="24" transform="translate(250,276)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#5</tspan><tspan class="node-id">  #24</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#24 #5
-Type not computed
-
-</title></g><g class="node" id="n25" data-id="25" transform="translate(255,902)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#25 If
-Type not computed
-
-[0] → #8  CTRL
-[1] → #23  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n31" data-id="31" transform="translate(372,609)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #31</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#31 .f =
-Type not computed
-
-[0] → #11  CTRL
+[0] → —  CTRL
 [1] → #230  MEM
 [2] → #9  DATA
-[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n32" data-id="32" transform="translate(319,1050)" style="opacity: 1;"><path class="box" d="M12,0H108L120,44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Region</tspan><tspan class="node-id">  #32</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#32 Region
-Type not computed
-
-[0] → —  DATA
-[1] → #15  CTRL
-[2] → #17  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n35" data-id="35" transform="translate(68,609)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>-</tspan><tspan class="node-id">  #35</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#35 -
-Type not computed
-
-[0] → #11  CTRL
-[1] → #13  DATA
-[2] → #36  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n36" data-id="36" transform="translate(98,276)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #36</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#36 #1
-Type not computed
-
-</title></g><g class="node" id="n37" data-id="37" transform="translate(583,1218)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #37</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#37 Return
+[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n37" data-id="37" transform="translate(24,484)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #37</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#37 Return
 Type not computed
 
-[0] → #12  CTRL
+[0] → —  CTRL
 [1] → #1  MEM
-[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n230" data-id="230" transform="translate(757,483)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #230</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#230 MemPhi_2
+[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n230" data-id="230" transform="translate(199,276)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #230</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#230 MemPhi_2
 Type not computed
 
-[0] → #11  ASSOC
+[0] → —  ASSOC
 [1] → #10  MEM
-[2] → #233  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #11</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n233" data-id="233" transform="translate(471,1050)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #233</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#233 MemPhi_2
+[2] → #233  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n233" data-id="233" transform="translate(266,484)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #233</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#233 MemPhi_2
 Type not computed
 
-[0] → #32  ASSOC
+[0] → —  ASSOC
 [1] → #31  MEM
-[2] → #230  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #32</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(24,379)"><text class="label" x="26" y="17"><tspan>Loop</tspan><tspan class="node-id">  #11</tspan></text><title>Loop · 16 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #11"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g><g class="region-head" transform="translate(243,862)"><text class="label" x="26" y="17"><tspan>If</tspan><tspan class="node-id">  #25</tspan></text><title>If · 5 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #25"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g></g><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
+[2] → #230  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"/><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
diff --git a/chapter11/docs/graph6.json b/chapter11/docs/graph6.json
index 1c08947a..512c308d 100644
--- a/chapter11/docs/graph6.json
+++ b/chapter11/docs/graph6.json
@@ -2,41 +2,24 @@
   "ver": 1,
   "comp": "chapter11/docs/graph6.svg",
   "step": 1,
-  "roots": [],
+  "roots": [37],
   "scope": 0,
   "nodes": [
-    {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 12, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null},
+    {"id": 1, "label": "MemMerge", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null},
     {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
-    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 37, "role": "CTRL", "label": null}], "proj": null},
     {"id": 4, "label": "#0", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 5, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
     {"id": 6, "label": "$mem", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 2, "role": "MEM", "label": null}], "proj": {"par": 2, "idx": 1}},
     {"id": 7, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 2}},
-    {"id": 8, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 16, "role": "CTRL", "label": null}], "proj": {"par": 16, "idx": 0}},
-    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 10, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
-    {"id": 11, "label": "Loop", "type": null, "kind": "LOOP", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 5, "role": "CTRL", "label": null}, {"idx": 2, "def": 32, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 12, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 16, "role": "CTRL", "label": null}], "proj": {"par": 16, "idx": 1}},
-    {"id": 13, "label": "φ_arg", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 11, "role": "ASSOC", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 35, "role": "DATA", "label": null}], "proj": null},
-    {"id": 14, "label": "<", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 4, "role": "DATA", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}], "proj": null},
-    {"id": 15, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": {"par": 25, "idx": 0}},
-    {"id": 16, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "DATA", "label": null}], "proj": null},
-    {"id": 17, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 25, "role": "CTRL", "label": null}], "proj": {"par": 25, "idx": 1}},
-    {"id": 21, "label": "//", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 22, "role": "DATA", "label": null}], "proj": null},
+    {"id": 9, "label": "new S", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 10, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 6, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 4, "role": "DATA", "label": null}], "proj": null},
+    {"id": 15, "label": "True", "type": null, "kind": "CTRL", "edges": [], "proj": {"par": 0, "idx": 0}},
+    {"id": 21, "label": "//", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 22, "role": "DATA", "label": null}], "proj": null},
     {"id": 22, "label": "#3", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 23, "label": "==", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 8, "role": "CTRL", "label": null}, {"idx": 1, "def": 13, "role": "DATA", "label": null}, {"idx": 2, "def": 24, "role": "DATA", "label": null}], "proj": null},
-    {"id": 24, "label": "#5", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 25, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 8, "role": "CTRL", "label": null}, {"idx": 1, "def": 23, "role": "DATA", "label": null}], "proj": null},
     {"id": 31, "label": ".f =", "type": null, "kind": "MEM", "edges": [{"idx": 0, "def": 15, "role": "CTRL", "label": null}, {"idx": 1, "def": 230, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}, {"idx": 3, "def": 21, "role": "DATA", "label": null}], "proj": null},
-    {"id": 32, "label": "Region", "type": null, "kind": "REGION", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 15, "role": "CTRL", "label": null}, {"idx": 2, "def": 17, "role": "CTRL", "label": null}], "proj": null},
-    {"id": 35, "label": "-", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 32, "role": "CTRL", "label": null}, {"idx": 1, "def": 13, "role": "DATA", "label": null}, {"idx": 2, "def": 36, "role": "DATA", "label": null}], "proj": null},
-    {"id": 36, "label": "#1", "type": null, "kind": "DATA", "edges": [], "proj": null},
-    {"id": 37, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 12, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
-    {"id": 230, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 11, "role": "ASSOC", "label": null}, {"idx": 1, "def": 10, "role": "MEM", "label": null}, {"idx": 2, "def": 233, "role": "MEM", "label": null}], "proj": null},
-    {"id": 233, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 32, "role": "ASSOC", "label": null}, {"idx": 1, "def": 31, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null}
+    {"id": 37, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 0, "role": "CTRL", "label": null}, {"idx": 1, "def": 1, "role": "MEM", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
+    {"id": 230, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 10, "role": "MEM", "label": null}, {"idx": 2, "def": 233, "role": "MEM", "label": null}], "proj": null},
+    {"id": 233, "label": "MemPhi_2", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 0, "role": "ASSOC", "label": null}, {"idx": 1, "def": 31, "role": "MEM", "label": null}, {"idx": 2, "def": 230, "role": "MEM", "label": null}], "proj": null}
   ],
   "groups": [
-    {"id": 11, "par": 0, "nodes": [8, 11, 12, 13, 14, 16, 23, 230]},
-    {"id": 25, "par": 11, "nodes": [15, 17, 25, 31, 32, 35, 233]}
   ]
 }
diff --git a/chapter11/docs/graph6.svg b/chapter11/docs/graph6.svg
index 8862f25c..d6dec88f 100644
--- a/chapter11/docs/graph6.svg
+++ b/chapter11/docs/graph6.svg
@@ -1,4 +1,4 @@
-<svg aria-label="Compiler graph" width="728" height="1808" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 728 1808" style="font-family: sans-serif;"><style>
+<svg aria-label="Compiler graph" width="820" height="568" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 820 568" style="font-family: sans-serif;"><style>
     html, body { height:100%; margin:0; font-family:sans-serif; }
     .viewer { height:100%; display:grid; grid-template-rows:auto minmax(0,1fr) auto; }
     .source { padding:8px; border-bottom:1px solid #ccc; }
@@ -60,128 +60,65 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(24,391)"><rect class="region-box" rx="8" width="642" height="1106" fill="#f1f6fc"/></g><g class="region" transform="translate(90,980)"><rect class="region-box" rx="8" width="336" height="460" fill="#f2f7ef"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e1i0" d="M282,819 L282,829 L58,829 L58,1522 L99,1522 L99,1550" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#1[0] → #12 · CTRL</title></path><path class="edge MEM" id="e1i1" d="M348,118 L348,128 L684,128 L684,1522 L129,1522 L129,1550" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M486,545 L486,575 L80,575 L80,935 L79,935 L79,1512 L159,1512 L159,1550" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #230 · MEM</title></path><path class="edge CTRL" id="e3i0" d="M88,1707 C88,1731 364,1734 364,1758" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #37 · CTRL</title></path><path class="edge CTRL" id="e9i0" d="M228,118 L228,148 L462,148 L462,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#9[0] → #5 · CTRL</title></path><path class="edge CTRL" id="e10i0" d="M228,118 L228,270" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#10[0] → #5 · CTRL</title></path><path class="edge MEM" id="e10i1" d="M348,118 L348,128 L239,128 L239,232 L252,232 L252,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#10[1] → #6 · MEM</title></path><path class="edge DATA" id="e10i2" d="M462,222 L462,242 L276,242 L276,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[2] → #9 · DATA</title></path><path class="edge DATA" id="e10i3" d="M310,222 L310,252 L300,252 L300,270" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[3] → #4 · DATA</title></path><path class="edge CTRL" id="e11i1" d="M228,118 L228,148 L182,148 L182,489" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#11[1] → #5 · CTRL</title></path><path class="edge CTRL" id="e11i2" d="M184,1321 L184,1331 L654,1331 L654,464 L212,464 L212,492" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#11[2] → #32 · CTRL</title></path><path class="edge DATA" id="e13i1" d="M468,118 L468,138 L193,138 L193,376 L314,376 L314,489" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[1] → #7 · DATA</title></path><path class="edge DATA" id="e13i2" d="M214,1425 L214,1435 L644,1435 L644,472 L354,472 L354,492" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[2] → #35 · DATA</title></path><path class="edge CTRL" id="e14i0" d="M182,545 L182,605 L223,605 L223,615" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#14[0] → #11 · CTRL</title></path><path class="edge DATA" id="e14i1" d="M310,222 L310,252 L334,252 L334,356 L556,356 L556,585 L253,585 L253,615" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[1] → #4 · DATA</title></path><path class="edge DATA" id="e14i2" d="M334,545 L334,595 L283,595 L283,615" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge CTRL" id="e16i0" d="M182,545 L182,719" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#16[0] → #11 · CTRL</title></path><path class="edge DATA" id="e16i1" d="M253,671 L253,681 L262,681 L262,719" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[1] → #14 · DATA</title></path><path class="edge CTRL" id="e21i0" d="M228,118 L228,148 L584,148 L584,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[0] → #5 · CTRL</title></path><path class="edge DATA" id="e21i1" d="M468,118 L468,138 L614,138 L614,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[1] → #7 · DATA</title></path><path class="edge DATA" id="e21i2" d="M644,118 L644,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[2] → #22 · DATA</title></path><path class="edge CTRL" id="e23i0" d="M162,819 L162,849 L203,849 L203,869" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#23[0] → #8 · CTRL</title></path><path class="edge DATA" id="e23i1" d="M334,545 L334,595 L369,595 L369,849 L233,849 L233,869" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#23[1] → #13 · DATA</title></path><path class="edge DATA" id="e23i2" d="M557,326 L557,336 L578,336 L578,565 L567,565 L567,859 L263,859 L263,869" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#23[2] → #24 · DATA</title></path><path class="edge CTRL" id="e25i0" d="M162,819 L162,935 L204,935 L204,1014" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#25[0] → #8 · CTRL</title></path><path class="edge DATA" id="e25i1" d="M233,925 L233,935 L284,935 L284,1014" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[1] → #23 · DATA</title></path><path class="edge CTRL" id="e31i0" d="M184,1114 L184,1134 L249,1134 L249,1164" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#31[0] → #15 · CTRL</title></path><path class="edge MEM" id="e31i1" d="M486,545 L486,575 L578,575 L578,935 L380,935 L380,1134 L273,1134 L273,1164" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#31[1] → #230 · MEM</title></path><path class="edge DATA" id="e31i2" d="M462,222 L462,242 L627,242 L627,336 L589,336 L589,945 L391,945 L391,1144 L297,1144 L297,1164" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[2] → #9 · DATA</title></path><path class="edge DATA" id="e31i3" d="M614,222 L614,232 L638,232 L638,346 L600,346 L600,955 L402,955 L402,1154 L321,1154 L321,1164" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[3] → #21 · DATA</title></path><path class="edge CTRL" id="e32i1" d="M184,1114 L184,1268" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#32[1] → #15 · CTRL</title></path><path class="edge CTRL" id="e32i2" d="M304,1114 L304,1124 L214,1124 L214,1268" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#32[2] → #17 · CTRL</title></path><path class="edge CTRL" id="e35i0" d="M184,1324 L184,1372" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#35[0] → #32 · CTRL</title></path><path class="edge DATA" id="e35i1" d="M334,545 L334,595 L91,595 L91,935 L102,935 L102,1354 L214,1354 L214,1372" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#35[1] → #13 · DATA</title></path><path class="edge DATA" id="e35i2" d="M405,326 L405,346 L567,346 L567,555 L358,555 L358,839 L113,839 L113,1344 L244,1344 L244,1372" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#35[2] → #36 · DATA</title></path><path class="edge CTRL" id="e37i0" d="M282,819 L282,829 L58,829 L58,1654" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#37[0] → #12 · CTRL</title></path><path class="edge MEM" id="e37i1" d="M129,1606 L129,1616 L88,1616 L88,1654" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#37[1] → #1 · MEM</title></path><path class="edge DATA" id="e37i2" d="M462,222 L462,242 L695,242 L695,1626 L118,1626 L118,1654" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#37[2] → #9 · DATA</title></path><path class="edge MEM" id="e230i1" d="M264,326 L264,366 L466,366 L466,489" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[1] → #10 · MEM</title></path><path class="edge MEM" id="e230i2" d="M336,1321 L336,1331 L634,1331 L634,480 L506,480 L506,492" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[2] → #233 · MEM</title></path><path class="edge MEM" id="e233i1" d="M285,1220 L285,1230 L316,1230 L316,1268" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[1] → #31 · MEM</title></path><path class="edge MEM" id="e233i2" d="M486,545 L486,575 L611,575 L611,965 L413,965 L413,1230 L356,1230 L356,1268" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[2] → #230 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(69,1556)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge MEM" id="e1i1" d="M306,118 L306,123 Q306,128 301,128 L151,128 Q143,128 143,136 L143,328 Q143,336 135,336 L92,336 Q84,336 84,344 L84,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[1] → #6 · MEM</title></path><path class="edge MEM" id="e1i2" d="M331,326 L331,338 Q331,346 323,346 L122,346 Q114,346 114,354 L114,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#1[2] → #230 · MEM</title></path><path class="edge MEM" id="e10i1" d="M306,118 L306,123 Q306,128 301,128 L270,128 Q262,128 262,136 L262,166" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#10[1] → #6 · MEM</title></path><path class="edge DATA" id="e10i2" d="M154,118 L154,130 Q154,138 162,138 L278,138 Q286,138 286,146 L286,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[2] → #9 · DATA</title></path><path class="edge DATA" id="e10i3" d="M584,118 L584,130 Q584,138 576,138 L318,138 Q310,138 310,146 L310,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[3] → #4 · DATA</title></path><path class="edge DATA" id="e21i1" d="M426,118 L426,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[1] → #7 · DATA</title></path><path class="edge DATA" id="e21i2" d="M736,118 L736,140 Q736,148 728,148 L464,148 Q456,148 456,156 L456,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[2] → #22 · DATA</title></path><path class="edge CTRL" id="e31i0" d="M206,326 L206,374" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#31[0] → #15 · CTRL</title></path><path class="edge MEM" id="e31i1" d="M331,326 L331,338 Q331,346 323,346 L238,346 Q230,346 230,354 L230,374" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#31[1] → #230 · MEM</title></path><path class="edge DATA" id="e31i2" d="M154,118 L154,224 Q154,232 162,232 L249,232 Q257,232 257,240 L257,354.5 Q257,356 255.5,356 L255.5,356 Q254,356 254,357.5 L254,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[2] → #9 · DATA</title></path><path class="edge DATA" id="e31i3" d="M426,222 L426,234 Q426,242 418,242 L409,242 Q401,242 401,250 L401,348 Q401,356 393,356 L286,356 Q278,356 278,364 L278,374" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#31[3] → #21 · DATA</title></path><path class="edge MEM" id="e37i1" d="M84,430 L84,435 Q84,440 89,440 L116,440 Q124,440 124,448 L124,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#37[1] → #1 · MEM</title></path><path class="edge DATA" id="e37i2" d="M154,118 L154,478" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#37[2] → #9 · DATA</title></path><path class="edge MEM" id="e230i1" d="M274,222 L274,227 Q274,232 279,232 L303,232 Q311,232 311,240 L311,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[1] → #10 · MEM</title></path><path class="edge MEM" id="e230i2" d="M311,534 L311,539 Q311,544 316,544 L404,544 Q412,544 412,536 L412,240 Q412,232 404,232 L359,232 Q351,232 351,240 L351,270" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#230[2] → #233 · MEM</title></path><path class="edge MEM" id="e233i1" d="M242,430 L242,435 Q242,440 247,440 L283,440 Q291,440 291,448 L291,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[1] → #31 · MEM</title></path><path class="edge MEM" id="e233i2" d="M331,326 L331,478" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#233[2] → #230 · MEM</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(24,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemMerge</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 MemMerge
 Type not computed
 
-[0] → #12  CTRL
+[0] → —  CTRL
 [1] → #6  MEM
-[2] → #230  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(168,24)" style="opacity: 1;"><path class="box" d="M0,0H360V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="180" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="180"/><title>#2 Start
+[2] → #230  MEM</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n2" data-id="2" transform="translate(246,24)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#2 Start
 Type not computed
 
-</title></g><g class="node" id="n3" data-id="3" transform="translate(328,1758)" style="opacity: 1;"><path class="box" d="M0,0H72V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="36" y="17"><tspan>Stop</tspan><tspan class="node-id">  #3</tspan></text><text class="type" text-anchor="middle" y="35" x="36"/><title>#3 Stop
+</title></g><g class="node" id="n4" data-id="4" transform="translate(524,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
 Type not computed
 
-[0] → #37  CTRL</title><circle class="port" cx="36" cy="0" r="3" fill="#536477"/><text class="slot" x="36" y="-7" text-anchor="middle">0</text></g><g class="node" id="n4" data-id="4" transform="translate(250,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #4</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 #0
-Type not computed
-
-</title></g><g class="node" id="n5" data-id="5" transform="translate(168,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 $ctrl
-Projection 0 of #2
-Type not computed
-
-[0] → #2  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(288,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
+</title></g><g class="node" id="n6" data-id="6" transform="translate(246,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #6/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 $mem
 Projection 1 of #2
 Type not computed
 
-[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(408,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
+[0] → #2  MEM</title></g><g class="node" id="n7" data-id="7" transform="translate(366,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #7/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 arg
 Projection 2 of #2
 Type not computed
 
-[0] → #2  DATA</title></g><g class="node" id="n8" data-id="8" transform="translate(102,769)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #8/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 True
-Projection 0 of #16
+[0] → #2  DATA</title></g><g class="node" id="n9" data-id="9" transform="translate(94,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
 Type not computed
 
-[0] → #16  CTRL</title></g><g class="node" id="n9" data-id="9" transform="translate(402,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>new S</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 new S
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(214,172)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 .f =
 Type not computed
 
-[0] → #5  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n10" data-id="10" transform="translate(204,276)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 .f =
-Type not computed
-
-[0] → #5  CTRL
+[0] → —  CTRL
 [1] → #6  MEM
 [2] → #9  DATA
-[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n11" data-id="11" transform="translate(122,495)" style="opacity: 1;"><path class="box" d="M20,0H100Q120,0 120,20V24Q120,44 100,44H20Q0,44 0,24V20Q0,0 20,0Z" fill="#ffe0ab"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Loop</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 Loop
-Type not computed
-
-[0] → —  DATA
-[1] → #5  CTRL
-[2] → #32  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n12" data-id="12" transform="translate(222,769)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #12/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 False
-Projection 1 of #16
+[3] → #4  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n15" data-id="15" transform="translate(165,294)" style="opacity: 1;"><path class="box" d="M0,0H82V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="41" y="17"><tspan>True</tspan><tspan class="node-id">  #15/0</tspan></text><text class="type" text-anchor="middle" y="35" x="41"/><title>#15 True
+Projection 0 of #0
 Type not computed
 
-[0] → #16  CTRL</title></g><g class="node" id="n13" data-id="13" transform="translate(274,495)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>φ_arg</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 φ_arg
+</title></g><g class="node" id="n21" data-id="21" transform="translate(366,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>//</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 //
 Type not computed
 
-[0] → #11  ASSOC
+[0] → —  CTRL
 [1] → #7  DATA
-[2] → #35  DATA</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #11</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n14" data-id="14" transform="translate(193,621)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>&lt;</tspan><tspan class="node-id">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 &lt;
+[2] → #22  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n22" data-id="22" transform="translate(676,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#3</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 #3
 Type not computed
 
-[0] → #11  CTRL
-[1] → #4  DATA
-[2] → #13  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n15" data-id="15" transform="translate(124,1064)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #15/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#15 True
-Projection 0 of #25
-Type not computed
-
-[0] → #25  CTRL</title></g><g class="node" id="n16" data-id="16" transform="translate(102,725)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#16 If
-Type not computed
-
-[0] → #11  CTRL
-[1] → #14  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n17" data-id="17" transform="translate(244,1064)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>False</tspan><tspan class="node-id">  #17/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#17 False
-Projection 1 of #25
-Type not computed
-
-[0] → #25  CTRL</title></g><g class="node" id="n21" data-id="21" transform="translate(554,172)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>//</tspan><tspan class="node-id">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 //
-Type not computed
-
-[0] → #5  CTRL
-[1] → #7  DATA
-[2] → #22  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n22" data-id="22" transform="translate(584,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#3</tspan><tspan class="node-id">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 #3
-Type not computed
-
-</title></g><g class="node" id="n23" data-id="23" transform="translate(173,875)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>==</tspan><tspan class="node-id">  #23</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#23 ==
-Type not computed
-
-[0] → #8  CTRL
-[1] → #13  DATA
-[2] → #24  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n24" data-id="24" transform="translate(497,276)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#5</tspan><tspan class="node-id">  #24</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#24 #5
-Type not computed
-
-</title></g><g class="node" id="n25" data-id="25" transform="translate(124,1020)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>If</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#25 If
-Type not computed
-
-[0] → #8  CTRL
-[1] → #23  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n31" data-id="31" transform="translate(225,1170)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #31</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#31 .f =
+</title></g><g class="node" id="n31" data-id="31" transform="translate(182,380)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>.f =</tspan><tspan class="node-id">  #31</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#31 .f =
 Type not computed
 
 [0] → #15  CTRL
 [1] → #230  MEM
 [2] → #9  DATA
-[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n32" data-id="32" transform="translate(124,1274)" style="opacity: 1;"><path class="box" d="M12,0H108L120,44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Region</tspan><tspan class="node-id">  #32</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#32 Region
-Type not computed
-
-[0] → —  DATA
-[1] → #15  CTRL
-[2] → #17  CTRL</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n35" data-id="35" transform="translate(154,1378)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>-</tspan><tspan class="node-id">  #35</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#35 -
-Type not computed
-
-[0] → #32  CTRL
-[1] → #13  DATA
-[2] → #36  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n36" data-id="36" transform="translate(345,276)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#1</tspan><tspan class="node-id">  #36</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#36 #1
-Type not computed
-
-</title></g><g class="node" id="n37" data-id="37" transform="translate(28,1660)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #37</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#37 Return
+[3] → #21  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n37" data-id="37" transform="translate(64,484)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #37</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#37 Return
 Type not computed
 
-[0] → #12  CTRL
+[0] → —  CTRL
 [1] → #1  MEM
-[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n230" data-id="230" transform="translate(426,495)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #230</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#230 MemPhi_2
+[2] → #9  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n230" data-id="230" transform="translate(271,276)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #230</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#230 MemPhi_2
 Type not computed
 
-[0] → #11  ASSOC
+[0] → —  ASSOC
 [1] → #10  MEM
-[2] → #233  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #11</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n233" data-id="233" transform="translate(276,1274)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #233</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#233 MemPhi_2
+[2] → #233  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n233" data-id="233" transform="translate(251,484)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>MemPhi_2</tspan><tspan class="node-id">  #233</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#233 MemPhi_2
 Type not computed
 
-[0] → #32  ASSOC
+[0] → —  ASSOC
 [1] → #31  MEM
-[2] → #230  MEM</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #32</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(24,391)"><text class="label" x="26" y="17"><tspan>Loop</tspan><tspan class="node-id">  #11</tspan></text><title>Loop · 15 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #11"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g><g class="region-head" transform="translate(90,980)"><text class="label" x="26" y="17"><tspan>If</tspan><tspan class="node-id">  #25</tspan></text><title>If · 7 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #25"><rect width="16" height="16" rx="2"/><text x="8" y="12" text-anchor="middle">−</text><title>Fold region</title></g></g></g><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
+[2] → #230  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g></g><g class="region-heads" style="opacity: 1;"/><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
diff --git a/chapter11/docs/graph7.svg b/chapter11/docs/graph7.svg
index e83b8d54..15d886dc 100644
--- a/chapter11/docs/graph7.svg
+++ b/chapter11/docs/graph7.svg
@@ -60,7 +60,7 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(164,171)"><rect class="region-box" rx="8" width="176" height="130" fill="#f1f6fc"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e8i1" d="M236,118 L236,223" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[1] → #1 · CTRL</title></path><path class="edge CTRL" id="e8i2" d="M236,276 L236,286 L328,286 L328,214 L266,214 L266,226" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[2] → #8 · CTRL</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(176,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #1/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 $ctrl
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(164,171)"><rect class="region-box" rx="8" width="176" height="130" fill="#f1f6fc"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e8i1" d="M236,118 L236,223" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[1] → #1 · CTRL</title></path><path class="edge CTRL" id="e8i2" d="M236,276 L236,281 Q236,286 241,286 L320,286 Q328,286 328,278 L328,222 Q328,214 320,214 L272,214 Q266,214 266,220 L266,226" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[2] → #8 · CTRL</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(176,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #1/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 $ctrl
 Projection 0 of #2
 Type not computed
 
diff --git a/chapter11/docs/graph8.svg b/chapter11/docs/graph8.svg
index 4db46240..d96a9a7d 100644
--- a/chapter11/docs/graph8.svg
+++ b/chapter11/docs/graph8.svg
@@ -60,7 +60,7 @@
     .count { font-size:20px; min-width:35px; text-align:center; }
     #N { width:6ch; }
     #scrub { width:clamp(120px,35vw,600px); }
-  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(24,171)"><rect class="region-box" rx="8" width="313" height="298" fill="#f1f6fc"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e3i0" d="M126,575 C126,599 215.5,602 215.5,626" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #21 · CTRL</title></path><path class="edge CTRL" id="e8i1" d="M116,118 L116,233" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[1] → #6 · CTRL</title></path><path class="edge CTRL" id="e8i2" d="M216,434 L216,444 L325,444 L325,224 L146,224 L146,236" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[2] → #5 · CTRL</title></path><path class="edge CTRL" id="e18i0" d="M116,289 L116,337" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#18[0] → #8 · CTRL</title></path><path class="edge DATA" id="e18i1" d="M347,118 L347,128 L302,128 L302,299 L196,299 L196,337" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#18[1] → #4 · DATA</title></path><path class="edge CTRL" id="e21i0" d="M96,437 L96,522" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[0] → #1 · CTRL</title></path><path class="edge DATA" id="e21i2" d="M347,118 L347,484 L156,484 L156,522" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[2] → #4 · DATA</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(36,387)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #1/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 True
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"><g class="region" transform="translate(24,171)"><rect class="region-box" rx="8" width="313" height="298" fill="#f1f6fc"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e3i0" d="M126,575 C126,599 215.5,602 215.5,626" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #21 · CTRL</title></path><path class="edge CTRL" id="e8i1" d="M116,118 L116,233" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[1] → #6 · CTRL</title></path><path class="edge CTRL" id="e8i2" d="M216,434 L216,439 Q216,444 221,444 L317,444 Q325,444 325,436 L325,232 Q325,224 317,224 L152,224 Q146,224 146,230 L146,236" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[2] → #5 · CTRL</title></path><path class="edge CTRL" id="e18i0" d="M116,289 L116,337" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#18[0] → #8 · CTRL</title></path><path class="edge DATA" id="e18i1" d="M347,118 L347,123 Q347,128 342,128 L310,128 Q302,128 302,136 L302,291 Q302,299 294,299 L204,299 Q196,299 196,307 L196,337" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#18[1] → #4 · DATA</title></path><path class="edge CTRL" id="e21i0" d="M96,437 L96,522" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[0] → #1 · CTRL</title></path><path class="edge DATA" id="e21i2" d="M347,118 L347,476 Q347,484 339,484 L164,484 Q156,484 156,492 L156,522" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[2] → #4 · DATA</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(36,387)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>True</tspan><tspan class="node-id">  #1/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 True
 Projection 0 of #18
 Type not computed