First pass README updates

author: Cliff Click <cliffc@acm.org> 2026-10-02 13:04:34 -0700
committer: Cliff Click <cliffc@acm.org> 2026-10-02 13:04:34 -0700
commit: e4dc3273f201ae741637b626998637cce973546b (patch)
tree: 7607c1da4378da42549e8142371d95bdca4e06e0 /chapter07/docs
parent: 6cd01a8d646750748a0af221073de8a7787472ad (diff)
download: Simple-e4dc3273f201ae741637b626998637cce973546b.tar.gz
Simple-e4dc3273f201ae741637b626998637cce973546b.zip
9 files changed, 706 insertions, 1166 deletions
diff --git a/chapter07/docs/07-graph1.json b/chapter07/docs/07-graph1.json
new file mode 100644
index 00000000..0f2c6c4d
--- /dev/null
+++ b/chapter07/docs/07-graph1.json
@@ -0,0 +1,27 @@
+{
+  "ver": 1,
+  "comp": "chapter07/docs/07-graph1.svg",
+  "step": 1,
+  "roots": [],
+  "scope": 0,
+  "nodes": [
+    {"id": 1, "label": "Scope", "type": null, "kind": "SCOPE", "edges": [{"idx": 0, "def": 18, "role": "ASSOC", "label": "3: $ctrl"}, {"idx": 1, "def": 16, "role": "ASSOC", "label": "3: arg"}], "proj": null},
+    {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
+    {"id": 5, "label": "Scope", "type": null, "kind": "SCOPE", "edges": [{"idx": 0, "def": 6, "role": "ASSOC", "label": "2: $ctrl"}, {"idx": 1, "def": 8, "role": "ASSOC", "label": "2: arg"}], "proj": null},
+    {"id": 6, "label": "Loop", "type": null, "kind": "LOOP", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 14, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 8, "label": "φ_arg", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 6, "role": "ASSOC", "label": null}, {"idx": 1, "def": 17, "role": "DATA", "label": null}], "proj": null},
+    {"id": 9, "label": "10", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 10, "label": "<", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 8, "role": "DATA", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
+    {"id": 11, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 6, "role": "CTRL", "label": null}, {"idx": 1, "def": 10, "role": "DATA", "label": null}], "proj": null},
+    {"id": 12, "label": "Scope", "type": null, "kind": "SCOPE", "edges": [{"idx": 0, "def": 19, "role": "ASSOC", "label": "2: $ctrl"}, {"idx": 1, "def": 8, "role": "ASSOC", "label": "2: arg"}], "proj": null},
+    {"id": 14, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
+    {"id": 15, "label": "1", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 16, "label": "+", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 8, "role": "DATA", "label": null}, {"idx": 2, "def": 15, "role": "DATA", "label": null}], "proj": null},
+    {"id": 17, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 1}},
+    {"id": 18, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}], "proj": {"par": 11, "idx": 0}},
+    {"id": 19, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}], "proj": {"par": 11, "idx": 1}}
+  ],
+  "groups": [
+    {"id": 6, "par": 0, "nodes": [6, 8]}
+  ]
+}
diff --git a/chapter07/docs/07-graph1.svg b/chapter07/docs/07-graph1.svg
index 94248cfb..e6ee94a4 100644
--- a/chapter07/docs/07-graph1.svg
+++ b/chapter07/docs/07-graph1.svg
@@ -1,268 +1,122 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: chapter07 Pages: 1 -->
-<svg width="726pt" height="440pt"
- viewBox="0.00 0.00 726.00 440.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 436)">
-<title>chapter07</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-436 722,-436 722,4 -4,4"/>
-<g id="clust1" class="cluster">
-<title>cluster_Nodes</title>
-<polygon fill="none" stroke="black" points="196,-100 196,-424 502,-424 502,-100 196,-100"/>
-</g>
-<g id="clust3" class="cluster">
-<title>cluster_Scope7_1</title>
-<polygon fill="none" stroke="black" points="8,-8 8,-92 288,-92 288,-8 8,-8"/>
-</g>
-<g id="clust4" class="cluster">
-<title>cluster_Scope7_2</title>
-<polygon fill="none" stroke="black" points="80,-16 80,-84 280,-84 280,-16 80,-16"/>
-</g>
-<g id="clust5" class="cluster">
-<title>cluster_Scope7_3</title>
-<polygon fill="none" stroke="black" points="152,-24 152,-76 272,-76 272,-24 152,-24"/>
-</g>
-<g id="clust6" class="cluster">
-<title>cluster_Scope1_1</title>
-<polygon fill="none" stroke="black" points="510,-192 510,-260 710,-260 710,-192 510,-192"/>
-</g>
-<g id="clust7" class="cluster">
-<title>cluster_Scope1_2</title>
-<polygon fill="none" stroke="black" points="582,-200 582,-252 702,-252 702,-200 582,-200"/>
-</g>
-<g id="clust8" class="cluster">
-<title>cluster_Scope14_1</title>
-<polygon fill="none" stroke="black" points="296,-16 296,-84 496,-84 496,-16 296,-16"/>
-</g>
-<g id="clust9" class="cluster">
-<title>cluster_Scope14_2</title>
-<polygon fill="none" stroke="black" points="368,-24 368,-76 488,-76 488,-24 368,-24"/>
-</g>
-<!-- Start2 -->
-<g id="node1" class="node">
-<title>Start2</title>
-<polygon fill="yellow" stroke="transparent" points="365,-387 365,-412 446,-412 446,-387 365,-387"/>
-<polygon fill="none" stroke="black" points="365,-387 365,-412 446,-412 446,-387 365,-387"/>
-<text text-anchor="start" x="387" y="-395.8" font-family="Times,serif" font-size="14.00">Start</text>
-<polygon fill="none" stroke="black" points="365,-356 365,-387 446,-387 446,-356 365,-356"/>
-<polygon fill="yellow" stroke="transparent" points="370,-361 370,-382 410,-382 410,-361 370,-361"/>
-<polygon fill="none" stroke="black" points="370,-361 370,-382 410,-382 410,-361 370,-361"/>
-<text text-anchor="start" x="373" y="-367.8" font-family="Times,serif" font-size="14.00">$ctrl</text>
-<polygon fill="none" stroke="black" points="410,-361 410,-382 441,-382 441,-361 410,-361"/>
-<text text-anchor="start" x="413" y="-367.8" font-family="Times,serif" font-size="14.00">arg</text>
-</g>
-<!-- Loop6 -->
-<g id="node2" class="node">
-<title>Loop6</title>
-<polygon fill="yellow" stroke="black" points="494,-316 440,-316 440,-280 494,-280 494,-316"/>
-<text text-anchor="middle" x="467" y="-294.3" font-family="Times,serif" font-size="14.00">Loop</text>
-</g>
-<!-- Loop6&#45;&gt;Start2 -->
-<g id="edge1" class="edge">
-<title>Loop6&#45;&gt;Start2:p0</title>
-<path fill="none" stroke="red" d="M439.64,-314.34C422.52,-324.68 402.19,-338.54 393.85,-350.32"/>
-<polygon fill="red" stroke="red" points="390.45,-349.41 390,-360 396.95,-352 390.45,-349.41"/>
-<text text-anchor="middle" x="436.64" y="-307.94" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_arg8 -->
-<g id="node3" class="node">
-<title>Phi_arg8</title>
-<ellipse fill="lightyellow" stroke="black" cx="385" cy="-298" rx="37.09" ry="18"/>
-<text text-anchor="middle" x="385" y="-294.3" font-family="Times,serif" font-size="14.00">φ_arg</text>
-</g>
-<!-- Phi_arg8&#45;&gt;Start2 -->
-<g id="edge3" class="edge">
-<title>Phi_arg8&#45;&gt;Start2:p1</title>
-<path fill="none" stroke="black" d="M402.63,-314.22C411.57,-323.35 421.25,-335.86 424.7,-349.71"/>
-<polygon fill="black" stroke="black" points="421.27,-350.52 426,-360 428.22,-349.64 421.27,-350.52"/>
-<text text-anchor="middle" x="399.63" y="-316.82" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_arg8&#45;&gt;Loop6 -->
-<g id="edge2" class="edge">
-<title>Phi_arg8&#45;&gt;Loop6</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M422.16,-298C424.62,-298 427.08,-298 429.55,-298"/>
-<polygon fill="black" stroke="black" points="429.67,-301.5 439.67,-298 429.67,-294.5 429.67,-301.5"/>
-<text text-anchor="middle" x="425.16" y="-291.6" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Con_9 -->
-<g id="node4" class="node">
-<title>Con_9</title>
-<ellipse fill="none" stroke="black" cx="303" cy="-298" rx="27" ry="18"/>
-<text text-anchor="middle" x="303" y="-294.3" font-family="Times,serif" font-size="14.00">10</text>
-</g>
-<!-- LT10 -->
-<g id="node5" class="node">
-<title>LT10</title>
-<ellipse fill="none" stroke="black" cx="374" cy="-226" rx="27" ry="18"/>
-<text text-anchor="middle" x="374" y="-222.3" font-family="Times,serif" font-size="14.00">&lt;</text>
-</g>
-<!-- LT10&#45;&gt;Phi_arg8 -->
-<g id="edge4" class="edge">
-<title>LT10&#45;&gt;Phi_arg8</title>
-<path fill="none" stroke="black" d="M376.66,-243.95C377.87,-251.65 379.34,-260.97 380.7,-269.64"/>
-<polygon fill="black" stroke="black" points="377.28,-270.39 382.29,-279.72 384.19,-269.3 377.28,-270.39"/>
-<text text-anchor="middle" x="373.66" y="-246.55" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- LT10&#45;&gt;Con_9 -->
-<g id="edge5" class="edge">
-<title>LT10&#45;&gt;Con_9</title>
-<path fill="none" stroke="black" d="M359.29,-241.5C349.39,-251.27 336.16,-264.31 325.01,-275.3"/>
-<polygon fill="black" stroke="black" points="322.36,-273 317.69,-282.51 327.27,-277.99 322.36,-273"/>
-<text text-anchor="middle" x="356.29" y="-244.1" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- If11 -->
-<g id="node6" class="node">
-<title>If11</title>
-<polygon fill="yellow" stroke="transparent" points="327,-143 327,-168 421,-168 421,-143 327,-143"/>
-<polygon fill="none" stroke="black" points="327,-143 327,-168 421,-168 421,-143 327,-143"/>
-<text text-anchor="start" x="368.5" y="-151.8" font-family="Times,serif" font-size="14.00">If</text>
-<polygon fill="none" stroke="black" points="327,-112 327,-143 421,-143 421,-112 327,-112"/>
-<polygon fill="yellow" stroke="transparent" points="332,-117 332,-138 372,-138 372,-117 332,-117"/>
-<polygon fill="none" stroke="black" points="332,-117 332,-138 372,-138 372,-117 332,-117"/>
-<text text-anchor="start" x="335" y="-123.8" font-family="Times,serif" font-size="14.00">True</text>
-<polygon fill="yellow" stroke="transparent" points="372,-117 372,-138 416,-138 416,-117 372,-117"/>
-<polygon fill="none" stroke="black" points="372,-117 372,-138 416,-138 416,-117 372,-117"/>
-<text text-anchor="start" x="375" y="-123.8" font-family="Times,serif" font-size="14.00">False</text>
-</g>
-<!-- If11&#45;&gt;Loop6 -->
-<g id="edge6" class="edge">
-<title>If11&#45;&gt;Loop6</title>
-<path fill="none" stroke="red" d="M396.87,-172.17C401.36,-178.63 405.94,-185.46 410,-192 426.23,-218.13 442.79,-249.22 453.84,-270.75"/>
-<polygon fill="red" stroke="red" points="450.85,-272.6 458.51,-279.92 457.09,-269.42 450.85,-272.6"/>
-<text text-anchor="middle" x="393.87" y="-174.77" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- If11&#45;&gt;LT10 -->
-<g id="edge7" class="edge">
-<title>If11&#45;&gt;LT10</title>
-<path fill="none" stroke="black" d="M374,-172.28C374,-180.58 374,-189.48 374,-197.56"/>
-<polygon fill="black" stroke="black" points="370.5,-197.6 374,-207.6 377.5,-197.6 370.5,-197.6"/>
-<text text-anchor="middle" x="371" y="-174.88" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Con_15 -->
-<g id="node7" class="node">
-<title>Con_15</title>
-<ellipse fill="none" stroke="black" cx="231" cy="-298" rx="27" ry="18"/>
-<text text-anchor="middle" x="231" y="-294.3" font-family="Times,serif" font-size="14.00">1</text>
-</g>
-<!-- Add16 -->
-<g id="node8" class="node">
-<title>Add16</title>
-<ellipse fill="none" stroke="black" cx="241" cy="-226" rx="27" ry="18"/>
-<text text-anchor="middle" x="241" y="-222.3" font-family="Times,serif" font-size="14.00">+</text>
-</g>
-<!-- Add16&#45;&gt;Phi_arg8 -->
-<g id="edge8" class="edge">
-<title>Add16&#45;&gt;Phi_arg8</title>
-<path fill="none" stroke="black" d="M262.25,-237.33C285.48,-248.62 323.06,-266.89 350.53,-280.24"/>
-<polygon fill="black" stroke="black" points="349.26,-283.52 359.78,-284.74 352.32,-277.22 349.26,-283.52"/>
-<text text-anchor="middle" x="265.25" y="-239.93" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Add16&#45;&gt;Con_15 -->
-<g id="edge9" class="edge">
-<title>Add16&#45;&gt;Con_15</title>
-<path fill="none" stroke="black" d="M238.58,-243.95C237.48,-251.65 236.15,-260.97 234.91,-269.64"/>
-<polygon fill="black" stroke="black" points="231.42,-269.33 233.47,-279.72 238.35,-270.32 231.42,-269.33"/>
-<text text-anchor="middle" x="235.58" y="-246.55" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Scope7_1 -->
-<g id="node9" class="node">
-<title>Scope7_1</title>
-<polygon fill="cyan" stroke="transparent" points="35,-39 35,-60 51,-60 51,-39 35,-39"/>
-<polygon fill="none" stroke="black" points="35,-39 35,-60 51,-60 51,-39 35,-39"/>
-<text text-anchor="start" x="38" y="-45.8" font-family="Times,serif" font-size="14.00">2</text>
-</g>
-<!-- Scope7_2 -->
-<g id="node10" class="node">
-<title>Scope7_2</title>
-<polygon fill="cyan" stroke="transparent" points="107,-39 107,-60 123,-60 123,-39 107,-39"/>
-<polygon fill="none" stroke="black" points="107,-39 107,-60 123,-60 123,-39 107,-39"/>
-<text text-anchor="start" x="110" y="-45.8" font-family="Times,serif" font-size="14.00">1</text>
-</g>
-<!-- Scope7_3 -->
-<g id="node11" class="node">
-<title>Scope7_3</title>
-<polygon fill="cyan" stroke="transparent" points="169,-39 169,-60 185,-60 185,-39 169,-39"/>
-<polygon fill="none" stroke="black" points="169,-39 169,-60 185,-60 185,-39 169,-39"/>
-<text text-anchor="start" x="172" y="-45.8" font-family="Times,serif" font-size="14.00">0</text>
-<polygon fill="none" stroke="black" points="185,-39 185,-60 225,-60 225,-39 185,-39"/>
-<text text-anchor="start" x="188" y="-45.8" font-family="Times,serif" font-size="14.00">$ctrl</text>
-<polygon fill="none" stroke="black" points="225,-39 225,-60 256,-60 256,-39 225,-39"/>
-<text text-anchor="start" x="228" y="-45.8" font-family="Times,serif" font-size="14.00">arg</text>
-</g>
-<!-- Scope7_3&#45;&gt;If11 -->
-<g id="edge10" class="edge">
-<title>Scope7_3:Scope7_3_$ctrl&#45;&gt;If11:p0</title>
-<path fill="none" stroke="cornflowerblue" stroke-dasharray="5,2" d="M205,-61C205,-74.83 289.37,-114.99 321.05,-124.81"/>
-<polygon fill="cornflowerblue" stroke="cornflowerblue" points="320.48,-128.27 331,-127 321.98,-121.43 320.48,-128.27"/>
-</g>
-<!-- Scope7_3&#45;&gt;Add16 -->
-<g id="edge11" class="edge">
-<title>Scope7_3:Scope7_3_arg&#45;&gt;Add16</title>
-<path fill="none" stroke="cornflowerblue" stroke-dasharray="5,2" d="M241,-61C241,-109.09 241,-165.12 241,-197.67"/>
-<polygon fill="cornflowerblue" stroke="cornflowerblue" points="237.5,-197.76 241,-207.76 244.5,-197.76 237.5,-197.76"/>
-</g>
-<!-- Scope1_1 -->
-<g id="node12" class="node">
-<title>Scope1_1</title>
-<polygon fill="cyan" stroke="transparent" points="537,-215 537,-236 553,-236 553,-215 537,-215"/>
-<polygon fill="none" stroke="black" points="537,-215 537,-236 553,-236 553,-215 537,-215"/>
-<text text-anchor="start" x="540" y="-221.8" font-family="Times,serif" font-size="14.00">1</text>
-</g>
-<!-- Scope1_2 -->
-<g id="node13" class="node">
-<title>Scope1_2</title>
-<polygon fill="cyan" stroke="transparent" points="599,-215 599,-236 615,-236 615,-215 599,-215"/>
-<polygon fill="none" stroke="black" points="599,-215 599,-236 615,-236 615,-215 599,-215"/>
-<text text-anchor="start" x="602" y="-221.8" font-family="Times,serif" font-size="14.00">0</text>
-<polygon fill="none" stroke="black" points="615,-215 615,-236 655,-236 655,-215 615,-215"/>
-<text text-anchor="start" x="618" y="-221.8" font-family="Times,serif" font-size="14.00">$ctrl</text>
-<polygon fill="none" stroke="black" points="655,-215 655,-236 686,-236 686,-215 655,-215"/>
-<text text-anchor="start" x="658" y="-221.8" font-family="Times,serif" font-size="14.00">arg</text>
-</g>
-<!-- Scope1_2&#45;&gt;Loop6 -->
-<g id="edge12" class="edge">
-<title>Scope1_2:Scope1_2_$ctrl&#45;&gt;Loop6</title>
-<path fill="none" stroke="cornflowerblue" stroke-dasharray="5,2" d="M635,-237C635,-264.54 553.92,-282.77 504.41,-291.34"/>
-<polygon fill="cornflowerblue" stroke="cornflowerblue" points="503.65,-287.92 494.37,-293.02 504.81,-294.82 503.65,-287.92"/>
-</g>
-<!-- Scope1_2&#45;&gt;Phi_arg8 -->
-<g id="edge13" class="edge">
-<title>Scope1_2:Scope1_2_arg&#45;&gt;Phi_arg8</title>
-<path fill="none" stroke="cornflowerblue" stroke-dasharray="5,2" d="M671,-237C671,-275.71 624.96,-252.41 587,-260 518.46,-273.71 498.88,-263.33 431,-280 428.04,-280.73 425,-281.58 421.97,-282.52"/>
-<polygon fill="cornflowerblue" stroke="cornflowerblue" points="420.79,-279.23 412.41,-285.72 423.01,-285.86 420.79,-279.23"/>
-</g>
-<!-- Scope14_1 -->
-<g id="node14" class="node">
-<title>Scope14_1</title>
-<polygon fill="cyan" stroke="transparent" points="323,-39 323,-60 339,-60 339,-39 323,-39"/>
-<polygon fill="none" stroke="black" points="323,-39 323,-60 339,-60 339,-39 323,-39"/>
-<text text-anchor="start" x="326" y="-45.8" font-family="Times,serif" font-size="14.00">1</text>
-</g>
-<!-- Scope14_2 -->
-<g id="node15" class="node">
-<title>Scope14_2</title>
-<polygon fill="cyan" stroke="transparent" points="385,-39 385,-60 401,-60 401,-39 385,-39"/>
-<polygon fill="none" stroke="black" points="385,-39 385,-60 401,-60 401,-39 385,-39"/>
-<text text-anchor="start" x="388" y="-45.8" font-family="Times,serif" font-size="14.00">0</text>
-<polygon fill="none" stroke="black" points="401,-39 401,-60 441,-60 441,-39 401,-39"/>
-<text text-anchor="start" x="404" y="-45.8" font-family="Times,serif" font-size="14.00">$ctrl</text>
-<polygon fill="none" stroke="black" points="441,-39 441,-60 472,-60 472,-39 441,-39"/>
-<text text-anchor="start" x="444" y="-45.8" font-family="Times,serif" font-size="14.00">arg</text>
-</g>
-<!-- Scope14_2&#45;&gt;Phi_arg8 -->
-<g id="edge15" class="edge">
-<title>Scope14_2:Scope14_2_arg&#45;&gt;Phi_arg8</title>
-<path fill="none" stroke="cornflowerblue" stroke-dasharray="5,2" d="M457,-61C457,-151.88 449.62,-178.21 410,-260 408.01,-264.11 405.61,-268.3 403.09,-272.3"/>
-<polygon fill="cornflowerblue" stroke="cornflowerblue" points="400.15,-270.4 397.51,-280.67 405.97,-274.28 400.15,-270.4"/>
-</g>
-<!-- Scope14_2&#45;&gt;If11 -->
-<g id="edge14" class="edge">
-<title>Scope14_2:Scope14_2_$ctrl&#45;&gt;If11:p1</title>
-<path fill="none" stroke="cornflowerblue" stroke-dasharray="5,2" d="M421,-61C421,-84.4 401.06,-88.09 395.45,-105.95"/>
-<polygon fill="cornflowerblue" stroke="cornflowerblue" points="391.97,-105.6 394,-116 398.89,-106.6 391.97,-105.6"/>
-</g>
-</g>
-</svg>
+<svg aria-label="Compiler graph" width="848" height="708" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 848 708" 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; }
+    #program { width:min(600px,80vw); vertical-align:middle; }
+    #status { margin-top:4px; }
+    #graph { min-height:0; overflow:hidden; position:relative; background:#fafbfc; }
+    #elk { width:100%; height:100%; }
+    #graph svg { display:block; }
+    .tools { display:flex; flex-wrap:wrap; align-items:center; gap:14px; margin-top:8px; font-size:12px; }
+    .hint { color:#616c78; }
+    .ctrl { color:#b63838; } .mem { color:#2867b2; } .data { color:#536477; }
+    .edge { fill:none; stroke-width:1.5; }
+    .edge.CTRL { stroke-width:2; }
+    .edge.ASSOC { stroke-dasharray:4 4; }
+    .edge.PARSER { stroke-dasharray:5 4; }
+    .parser rect { fill:#f6f0ff; stroke:#7956a5; stroke-width:1.5; stroke-dasharray:5 4; }
+    .edge.selected { stroke-width:3.5; }
+    .edge.bundle { stroke-width:4; }
+    .edge.bundle.selected { stroke-width:6; }
+    .edge-hit { fill:none; stroke:transparent; stroke-width:12; vector-effect:non-scaling-stroke; pointer-events:stroke; cursor:pointer; }
+    .edge-jump { fill:transparent; pointer-events:all; cursor:pointer; }
+    .node { cursor:pointer; }
+    .box { stroke:#758191; stroke-width:1; }
+    .node.held .box { stroke-dasharray:5 3; }
+    .node.near .box { stroke:#c18221; stroke-width:2; }
+    .node.focus .box { stroke:#9c4900; stroke-width:3; }
+    .node.selected .box { stroke:#1569b9; stroke-width:3; }
+    .node.folded .box { stroke-width:4; }
+    .node.folding .box { fill:#f4ccd7; }
+    .fold-tag { font-size:9px; font-weight:700; fill:#963751; }
+    .peep-area { fill:#fff3d9; fill-opacity:.8; stroke:#c18221; stroke-width:2; pointer-events:none; }
+    .node.peep-edit .box { stroke:#9c4900; stroke-width:3; }
+    .node.error .box { stroke:#b42318; stroke-width:4; }
+    #event.error { color:#b42318; font-weight:600; white-space:pre-wrap; overflow-wrap:anywhere; }
+    .peep-ghosts { pointer-events:none; }
+    .region-box { stroke:#9da9b8; stroke-width:1.5; }
+    .fold-btn { cursor:pointer; }
+    .fold-btn rect { fill:white; stroke:#596674; }
+    .fold-btn text { font-size:14px; fill:#152330; }
+    .fold-btn:focus rect { stroke:#1569b9; stroke-width:2; }
+    .shortcut { cursor:pointer; }
+    .shortcut path { fill:none; stroke-width:1.5; }
+    .shortcut rect { fill:#fff8ec; stroke:#b63838; stroke-dasharray:3 2; }
+    .shortcut text { font-size:11px; fill:#783030; }
+    .shortcut.selected rect, .shortcut:focus rect { stroke-width:2.5; }
+    .label { font-size:12px; fill:#152330; font-weight:600; }
+    .node-id { font-size:10px; fill:#596674; font-weight:400; }
+    .type { font-size:11px; fill:#455768; }
+    .port { stroke:#536477; stroke-width:1; }
+    .row { stroke:#b6afcf; stroke-width:1; }
+    .bind { font-size:12px; fill:#152330; }
+    .slot { font-size:10px; fill:#364352; paint-order:stroke; stroke:#fafbfc; stroke-width:3; }
+    #detail { position:absolute; top:8px; right:8px; margin:0; padding:12px; max-width:320px;
+      max-height:45%; overflow:auto; white-space:pre-wrap; overflow-wrap:anywhere;
+      background:#fffffff2; border:1px solid #bac5d0; border-radius:4px; font-size:12px; }
+    .controls { display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:6px; padding:6px; }
+    .button { color:white; background:black; font-size:20px; min-width:30px; }
+    .button:disabled { background:grey; }
+    .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(32,171)"><rect class="region-box" rx="8" width="296" height="102" fill="#f1f6fc"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge ASSOC" id="e1i0" d="M84,527 C84,551 735.5,524 735.5,548" stroke="#9396a3" marker-start="url(#arrow-ASSOC)" style="opacity: 1;"><title>#1[0] → #18 · ASSOC · 3: $ctrl</title></path><path class="edge ASSOC" id="e1i1" d="M256,379 C256,403 795.5,524 795.5,548" stroke="#9396a3" marker-start="url(#arrow-ASSOC)" style="opacity: 1;"><title>#1[1] → #16 · ASSOC · 3: arg</title></path><path class="edge ASSOC" id="e5i0" d="M104,258 C104,282 735.5,255 735.5,279" stroke="#9396a3" marker-start="url(#arrow-ASSOC)" style="opacity: 1;"><title>#5[0] → #6 · ASSOC · 2: $ctrl</title></path><path class="edge ASSOC" id="e5i1" d="M256,258 C256,282 795.5,255 795.5,279" stroke="#9396a3" marker-start="url(#arrow-ASSOC)" style="opacity: 1;"><title>#5[1] → #8 · ASSOC · 2: arg</title></path><path class="edge CTRL" id="e6i1" d="M124,118 L124,205" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#6[1] → #14 · CTRL</title></path><path class="edge DATA" id="e8i1" d="M244,118 L244,128 L256,128 L256,205" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#8[1] → #17 · DATA</title></path><path class="edge DATA" id="e10i1" d="M256,261 L256,298 L408,298 L408,326" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[1] → #8 · DATA</title></path><path class="edge DATA" id="e10i2" d="M572,278 L572,288 L438,288 L438,326" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[2] → #9 · DATA</title></path><path class="edge CTRL" id="e11i0" d="M104,261 L104,430" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#11[0] → #6 · CTRL</title></path><path class="edge DATA" id="e11i1" d="M408,382 L408,392 L184,392 L184,430" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#11[1] → #10 · DATA</title></path><path class="edge ASSOC" id="e12i0" d="M204,527 C204,551 735.5,604 735.5,628" stroke="#9396a3" marker-start="url(#arrow-ASSOC)" style="opacity: 1;"><title>#12[0] → #19 · ASSOC · 2: $ctrl</title></path><path class="edge ASSOC" id="e12i1" d="M256,258 C256,282 795.5,604 795.5,628" stroke="#9396a3" marker-start="url(#arrow-ASSOC)" style="opacity: 1;"><title>#12[1] → #8 · ASSOC · 2: arg</title></path><path class="edge DATA" id="e16i1" d="M256,261 L256,326" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[1] → #8 · DATA</title></path><path class="edge DATA" id="e16i2" d="M420,278 L420,288 L286,288 L286,326" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #15 · 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(704,548)" style="opacity: 1;"><path class="box" d="M4,0H116Q120,0 120,4V52Q120,56 116,56H4Q0,56 0,52V4Q0,0 4,0Z" fill="#e5e0ff"/><text class="label" text-anchor="middle" x="60" y="48"><tspan>Scope</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 Scope
+Type not computed
+
+[0] → #18  ASSOC  3: $ctrl
+[1] → #16  ASSOC  3: arg</title><line class="row" x1="0" x2="120" y1="30" y2="30"/><line class="row" x1="63" x2="63" y1="0" y2="30"/><text class="bind" x="31.5" y="20" text-anchor="middle">3: $ctrl</text><text class="bind" x="91.5" y="20" text-anchor="middle">3: arg</text><circle class="port" cx="31.5" cy="0" r="3" fill="#536477"/><circle class="port" cx="91.5" cy="0" r="3" fill="#536477"/><text class="slot" x="31.5" y="-7" text-anchor="middle">0</text><text class="slot" x="91.5" y="-7" text-anchor="middle">1</text></g><g class="node" id="n2" data-id="2" transform="translate(64,24)" 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="n5" data-id="5" transform="translate(704,279)" style="opacity: 1;"><path class="box" d="M4,0H116Q120,0 120,4V52Q120,56 116,56H4Q0,56 0,52V4Q0,0 4,0Z" fill="#e5e0ff"/><text class="label" text-anchor="middle" x="60" y="48"><tspan>Scope</tspan><tspan class="node-id">  #5</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 Scope
+Type not computed
+
+[0] → #6  ASSOC  2: $ctrl
+[1] → #8  ASSOC  2: arg</title><line class="row" x1="0" x2="120" y1="30" y2="30"/><line class="row" x1="63" x2="63" y1="0" y2="30"/><text class="bind" x="31.5" y="20" text-anchor="middle">2: $ctrl</text><text class="bind" x="91.5" y="20" text-anchor="middle">2: arg</text><circle class="port" cx="31.5" cy="0" r="3" fill="#536477"/><circle class="port" cx="91.5" cy="0" r="3" fill="#536477"/><text class="slot" x="31.5" y="-7" text-anchor="middle">0</text><text class="slot" x="91.5" y="-7" text-anchor="middle">1</text></g><g class="node" id="n6" data-id="6" transform="translate(44,211)" 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">  #6</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 Loop
+Type not computed
+
+[0] → —  DATA
+[1] → #14  CTRL</title><circle class="port" cx="40" cy="-3" r="3" fill="white"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><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="n8" data-id="8" transform="translate(196,211)" 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">  #8</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 φ_arg
+Type not computed
+
+[0] → #6  ASSOC
+[1] → #17  DATA</title><circle class="port" cx="-3" cy="22" r="3" fill="#536477"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><path class="reg" fill="none" stroke="#b63838" d="M-3,22H-18m4,-3l-4,3l4,3"><title>[0] → #6</title></path><text class="slot" x="-10" y="15" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text></g><g class="node" id="n9" data-id="9" transform="translate(512,228)" 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>10</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 10
+Type not computed
+
+</title></g><g class="node" id="n10" data-id="10" transform="translate(348,332)" 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">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 &lt;
+Type not computed
+
+[0] → —  DATA
+[1] → #8  DATA
+[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="n11" data-id="11" transform="translate(24,436)" 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">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#11 If
+Type not computed
+
+[0] → #6  CTRL
+[1] → #10  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="n12" data-id="12" transform="translate(704,628)" style="opacity: 1;"><path class="box" d="M4,0H116Q120,0 120,4V52Q120,56 116,56H4Q0,56 0,52V4Q0,0 4,0Z" fill="#e5e0ff"/><text class="label" text-anchor="middle" x="60" y="48"><tspan>Scope</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 Scope
+Type not computed
+
+[0] → #19  ASSOC  2: $ctrl
+[1] → #8  ASSOC  2: arg</title><line class="row" x1="0" x2="120" y1="30" y2="30"/><line class="row" x1="63" x2="63" y1="0" y2="30"/><text class="bind" x="31.5" y="20" text-anchor="middle">2: $ctrl</text><text class="bind" x="91.5" y="20" text-anchor="middle">2: arg</text><circle class="port" cx="31.5" cy="0" r="3" fill="#536477"/><circle class="port" cx="91.5" cy="0" r="3" fill="#536477"/><text class="slot" x="31.5" y="-7" text-anchor="middle">0</text><text class="slot" x="91.5" y="-7" text-anchor="middle">1</text></g><g class="node" id="n14" data-id="14" transform="translate(64,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #14/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#14 $ctrl
+Projection 0 of #2
+Type not computed
+
+[0] → #2  CTRL</title></g><g class="node" id="n15" data-id="15" transform="translate(360,228)" 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">  #15</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#15 1
+Type not computed
+
+</title></g><g class="node" id="n16" data-id="16" transform="translate(196,332)" 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">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 +
+Type not computed
+
+[0] → —  DATA
+[1] → #8  DATA
+[2] → #15  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(184,68)" 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">  #17/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#17 arg
+Projection 1 of #2
+Type not computed
+
+[0] → #2  DATA</title></g><g class="node" id="n18" data-id="18" transform="translate(24,480)" 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">  #18/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#18 True
+Projection 0 of #11
+Type not computed
+
+[0] → #11  CTRL</title></g><g class="node" id="n19" data-id="19" transform="translate(144,480)" 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">  #19/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#19 False
+Projection 1 of #11
+Type not computed
+
+[0] → #11  CTRL</title></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(32,171)"><text class="label" x="26" y="17"><tspan>Loop</tspan><tspan class="node-id">  #6</tspan></text><title>Loop · 2 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #6"><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>
diff --git a/chapter07/docs/07-graph2.json b/chapter07/docs/07-graph2.json
new file mode 100644
index 00000000..cc0e6d6c
--- /dev/null
+++ b/chapter07/docs/07-graph2.json
@@ -0,0 +1,26 @@
+{
+  "ver": 1,
+  "comp": "chapter07/docs/07-graph2.svg",
+  "step": 1,
+  "roots": [],
+  "scope": 0,
+  "nodes": [
+    {"id": 1, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
+    {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
+    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 17, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 4, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 1}},
+    {"id": 5, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}], "proj": {"par": 11, "idx": 0}},
+    {"id": 6, "label": "Loop", "type": null, "kind": "LOOP", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 1, "role": "CTRL", "label": null}, {"idx": 2, "def": 5, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 7, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 11, "role": "CTRL", "label": null}], "proj": {"par": 11, "idx": 1}},
+    {"id": 8, "label": "φ_arg", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 6, "role": "ASSOC", "label": null}, {"idx": 1, "def": 4, "role": "DATA", "label": null}, {"idx": 2, "def": 16, "role": "DATA", "label": null}], "proj": null},
+    {"id": 9, "label": "10", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 10, "label": "<", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 8, "role": "DATA", "label": null}, {"idx": 2, "def": 9, "role": "DATA", "label": null}], "proj": null},
+    {"id": 11, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 6, "role": "CTRL", "label": null}, {"idx": 1, "def": 10, "role": "DATA", "label": null}], "proj": null},
+    {"id": 15, "label": "1", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 16, "label": "+", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 8, "role": "DATA", "label": null}, {"idx": 2, "def": 15, "role": "DATA", "label": null}], "proj": null},
+    {"id": 17, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 7, "role": "CTRL", "label": null}, {"idx": 1, "def": 8, "role": "DATA", "label": null}], "proj": null}
+  ],
+  "groups": [
+    {"id": 6, "par": 0, "nodes": [5, 6, 7, 8, 10, 11, 16]}
+  ]
+}
diff --git a/chapter07/docs/07-graph2.svg b/chapter07/docs/07-graph2.svg
index 1fec9556..72153555 100644
--- a/chapter07/docs/07-graph2.svg
+++ b/chapter07/docs/07-graph2.svg
@@ -1,184 +1,119 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: chapter07 Pages: 1 -->
-<svg width="330pt" height="492pt"
- viewBox="0.00 0.00 330.00 492.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 488)">
-<title>chapter07</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-488 326,-488 326,4 -4,4"/>
-<g id="clust1" class="cluster">
-<title>cluster_Nodes</title>
-<polygon fill="none" stroke="black" points="8,-8 8,-476 314,-476 314,-8 8,-8"/>
-</g>
-<!-- Start2 -->
-<g id="node1" class="node">
-<title>Start2</title>
-<polygon fill="yellow" stroke="transparent" points="141,-439 141,-464 222,-464 222,-439 141,-439"/>
-<polygon fill="none" stroke="black" points="141,-439 141,-464 222,-464 222,-439 141,-439"/>
-<text text-anchor="start" x="163" y="-447.8" font-family="Times,serif" font-size="14.00">Start</text>
-<polygon fill="none" stroke="black" points="141,-408 141,-439 222,-439 222,-408 141,-408"/>
-<polygon fill="yellow" stroke="transparent" points="146,-413 146,-434 186,-434 186,-413 146,-413"/>
-<polygon fill="none" stroke="black" points="146,-413 146,-434 186,-434 186,-413 146,-413"/>
-<text text-anchor="start" x="149" y="-419.8" font-family="Times,serif" font-size="14.00">$ctrl</text>
-<polygon fill="none" stroke="black" points="186,-413 186,-434 217,-434 217,-413 186,-413"/>
-<text text-anchor="start" x="189" y="-419.8" font-family="Times,serif" font-size="14.00">arg</text>
-</g>
-<!-- Stop3 -->
-<g id="node2" class="node">
-<title>Stop3</title>
-<polygon fill="yellow" stroke="black" points="153,-52 99,-52 99,-16 153,-16 153,-52"/>
-<text text-anchor="middle" x="126" y="-30.3" font-family="Times,serif" font-size="14.00">Stop</text>
-</g>
-<!-- Return17 -->
-<g id="node10" class="node">
-<title>Return17</title>
-<polygon fill="yellow" stroke="black" points="159,-124 93,-124 93,-88 159,-88 159,-124"/>
-<text text-anchor="middle" x="126" y="-102.3" font-family="Times,serif" font-size="14.00">Return</text>
-</g>
-<!-- Stop3&#45;&gt;Return17 -->
-<g id="edge1" class="edge">
-<title>Stop3&#45;&gt;Return17</title>
-<path fill="none" stroke="red" d="M126,-52.3C126,-60.02 126,-69.29 126,-77.89"/>
-<polygon fill="red" stroke="red" points="122.5,-77.9 126,-87.9 129.5,-77.9 122.5,-77.9"/>
-<text text-anchor="middle" x="123" y="-54.9" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Loop6 -->
-<g id="node3" class="node">
-<title>Loop6</title>
-<polygon fill="yellow" stroke="black" points="306,-368 252,-368 252,-332 306,-332 306,-368"/>
-<text text-anchor="middle" x="279" y="-346.3" font-family="Times,serif" font-size="14.00">Loop</text>
-</g>
-<!-- Loop6&#45;&gt;Start2 -->
-<g id="edge2" class="edge">
-<title>Loop6&#45;&gt;Start2:p0</title>
-<path fill="none" stroke="red" d="M251.93,-364.13C226.34,-376.71 189.56,-395.24 173.73,-405.41"/>
-<polygon fill="red" stroke="red" points="171.34,-402.85 166,-412 175.88,-408.18 171.34,-402.85"/>
-<text text-anchor="middle" x="248.93" y="-357.73" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- If11 -->
-<g id="node7" class="node">
-<title>If11</title>
-<polygon fill="yellow" stroke="transparent" points="32,-195 32,-220 126,-220 126,-195 32,-195"/>
-<polygon fill="none" stroke="black" points="32,-195 32,-220 126,-220 126,-195 32,-195"/>
-<text text-anchor="start" x="73.5" y="-203.8" font-family="Times,serif" font-size="14.00">If</text>
-<polygon fill="none" stroke="black" points="32,-164 32,-195 126,-195 126,-164 32,-164"/>
-<polygon fill="yellow" stroke="transparent" points="37,-169 37,-190 77,-190 77,-169 37,-169"/>
-<polygon fill="none" stroke="black" points="37,-169 37,-190 77,-190 77,-169 37,-169"/>
-<text text-anchor="start" x="40" y="-175.8" font-family="Times,serif" font-size="14.00">True</text>
-<polygon fill="yellow" stroke="transparent" points="77,-169 77,-190 121,-190 121,-169 77,-169"/>
-<polygon fill="none" stroke="black" points="77,-169 77,-190 121,-190 121,-169 77,-169"/>
-<text text-anchor="start" x="80" y="-175.8" font-family="Times,serif" font-size="14.00">False</text>
-</g>
-<!-- Loop6&#45;&gt;If11 -->
-<g id="edge3" class="edge">
-<title>Loop6&#45;&gt;If11:p0</title>
-<path fill="none" stroke="red" d="M251.78,-335.24C248.86,-334.04 245.9,-332.93 243,-332 156.98,-304.48 103.76,-362.82 43,-296 18.41,-268.96 14.64,-203.69 27.49,-184.44"/>
-<polygon fill="red" stroke="red" points="29.46,-187.33 36,-179 25.69,-181.43 29.46,-187.33"/>
-<text text-anchor="middle" x="248.78" y="-328.84" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_arg8 -->
-<g id="node4" class="node">
-<title>Phi_arg8</title>
-<ellipse fill="lightyellow" stroke="black" cx="125" cy="-350" rx="37.09" ry="18"/>
-<text text-anchor="middle" x="125" y="-346.3" font-family="Times,serif" font-size="14.00">φ_arg</text>
-</g>
-<!-- Phi_arg8&#45;&gt;Start2 -->
-<g id="edge5" class="edge">
-<title>Phi_arg8&#45;&gt;Start2:p1</title>
-<path fill="none" stroke="black" d="M154.55,-360.93C173.21,-369 194.84,-382.27 200.56,-401.87"/>
-<polygon fill="black" stroke="black" points="197.12,-402.59 202,-412 204.05,-401.61 197.12,-402.59"/>
-<text text-anchor="middle" x="151.55" y="-363.53" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_arg8&#45;&gt;Loop6 -->
-<g id="edge4" class="edge">
-<title>Phi_arg8&#45;&gt;Loop6</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M143.47,-334.01C153.54,-326.34 166.66,-317.98 180,-314 203,-307.14 211.35,-306.06 234,-314 241.14,-316.5 247.99,-320.67 254.09,-325.3"/>
-<polygon fill="black" stroke="black" points="251.99,-328.1 261.92,-331.78 256.45,-322.71 251.99,-328.1"/>
-<text text-anchor="middle" x="140.47" y="-327.61" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Add16 -->
-<g id="node9" class="node">
-<title>Add16</title>
-<ellipse fill="none" stroke="black" cx="203" cy="-278" rx="27" ry="18"/>
-<text text-anchor="middle" x="203" y="-274.3" font-family="Times,serif" font-size="14.00">+</text>
-</g>
-<!-- Con_9 -->
-<g id="node5" class="node">
-<title>Con_9</title>
-<ellipse fill="none" stroke="black" cx="43" cy="-350" rx="27" ry="18"/>
-<text text-anchor="middle" x="43" y="-346.3" font-family="Times,serif" font-size="14.00">10</text>
-</g>
-<!-- LT10 -->
-<g id="node6" class="node">
-<title>LT10</title>
-<ellipse fill="none" stroke="black" cx="79" cy="-278" rx="27" ry="18"/>
-<text text-anchor="middle" x="79" y="-274.3" font-family="Times,serif" font-size="14.00">&lt;</text>
-</g>
-<!-- LT10&#45;&gt;Phi_arg8 -->
-<g id="edge7" class="edge">
-<title>LT10&#45;&gt;Phi_arg8</title>
-<path fill="none" stroke="black" d="M89.44,-294.88C95.12,-303.53 102.28,-314.42 108.68,-324.17"/>
-<polygon fill="black" stroke="black" points="105.87,-326.26 114.28,-332.69 111.72,-322.41 105.87,-326.26"/>
-<text text-anchor="middle" x="86.44" y="-297.48" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- LT10&#45;&gt;Con_9 -->
-<g id="edge8" class="edge">
-<title>LT10&#45;&gt;Con_9</title>
-<path fill="none" stroke="black" d="M70.65,-295.24C66.29,-303.72 60.85,-314.29 55.96,-323.8"/>
-<polygon fill="black" stroke="black" points="52.77,-322.36 51.3,-332.85 58.99,-325.56 52.77,-322.36"/>
-<text text-anchor="middle" x="67.65" y="-297.84" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- If11&#45;&gt;Loop6 -->
-<g id="edge9" class="edge">
-<title>If11&#45;&gt;Loop6</title>
-<path fill="none" stroke="red" d="M134.07,-205.07C167.93,-214.93 210.21,-231.94 239,-260 256.28,-276.84 266.71,-302.48 272.57,-321.93"/>
-<polygon fill="red" stroke="red" points="269.24,-323.03 275.3,-331.72 275.98,-321.15 269.24,-323.03"/>
-<text text-anchor="middle" x="137.07" y="-198.67" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- If11&#45;&gt;LT10 -->
-<g id="edge10" class="edge">
-<title>If11&#45;&gt;LT10</title>
-<path fill="none" stroke="black" d="M79,-224.28C79,-232.58 79,-241.48 79,-249.56"/>
-<polygon fill="black" stroke="black" points="75.5,-249.6 79,-259.6 82.5,-249.6 75.5,-249.6"/>
-<text text-anchor="middle" x="76" y="-226.88" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Con_15 -->
-<g id="node8" class="node">
-<title>Con_15</title>
-<ellipse fill="none" stroke="black" cx="207" cy="-350" rx="27" ry="18"/>
-<text text-anchor="middle" x="207" y="-346.3" font-family="Times,serif" font-size="14.00">1</text>
-</g>
-<!-- Add16&#45;&gt;Phi_arg8 -->
-<g id="edge11" class="edge">
-<title>Add16&#45;&gt;Phi_arg8</title>
-<path fill="none" stroke="black" d="M180.01,-299.63C170.41,-308.25 159.23,-318.28 149.47,-327.04"/>
-<polygon fill="black" stroke="black" points="182.48,-302.11 187.59,-292.83 177.81,-296.9 182.48,-302.11"/>
-<polygon fill="black" stroke="black" points="147.11,-324.46 142,-333.74 151.78,-329.67 147.11,-324.46"/>
-<text text-anchor="middle" x="184.59" y="-295.43" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Add16&#45;&gt;Con_15 -->
-<g id="edge12" class="edge">
-<title>Add16&#45;&gt;Con_15</title>
-<path fill="none" stroke="black" d="M203.99,-296.3C204.43,-304.02 204.96,-313.29 205.45,-321.89"/>
-<polygon fill="black" stroke="black" points="201.96,-322.11 206.02,-331.9 208.95,-321.71 201.96,-322.11"/>
-<text text-anchor="middle" x="200.99" y="-298.9" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Return17&#45;&gt;Phi_arg8 -->
-<g id="edge14" class="edge">
-<title>Return17&#45;&gt;Phi_arg8</title>
-<path fill="none" stroke="black" d="M133.07,-124.33C136.84,-134.53 141.09,-147.78 143,-160 151.97,-217.35 140.08,-285.24 131.79,-322.03"/>
-<polygon fill="black" stroke="black" points="128.33,-321.44 129.46,-331.97 135.14,-323.03 128.33,-321.44"/>
-<text text-anchor="middle" x="130.07" y="-126.93" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Return17&#45;&gt;If11 -->
-<g id="edge13" class="edge">
-<title>Return17&#45;&gt;If11:p1</title>
-<path fill="none" stroke="red" d="M113.92,-124C108.25,-133.3 102.24,-145.44 99.95,-157.94"/>
-<polygon fill="red" stroke="red" points="96.46,-157.71 99,-168 103.43,-158.38 96.46,-157.71"/>
-<text text-anchor="middle" x="110.92" y="-126.6" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-</g>
-</svg>
+<svg aria-label="Compiler graph" width="841" height="788" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841 788" 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; }
+    #program { width:min(600px,80vw); vertical-align:middle; }
+    #status { margin-top:4px; }
+    #graph { min-height:0; overflow:hidden; position:relative; background:#fafbfc; }
+    #elk { width:100%; height:100%; }
+    #graph svg { display:block; }
+    .tools { display:flex; flex-wrap:wrap; align-items:center; gap:14px; margin-top:8px; font-size:12px; }
+    .hint { color:#616c78; }
+    .ctrl { color:#b63838; } .mem { color:#2867b2; } .data { color:#536477; }
+    .edge { fill:none; stroke-width:1.5; }
+    .edge.CTRL { stroke-width:2; }
+    .edge.ASSOC { stroke-dasharray:4 4; }
+    .edge.PARSER { stroke-dasharray:5 4; }
+    .parser rect { fill:#f6f0ff; stroke:#7956a5; stroke-width:1.5; stroke-dasharray:5 4; }
+    .edge.selected { stroke-width:3.5; }
+    .edge.bundle { stroke-width:4; }
+    .edge.bundle.selected { stroke-width:6; }
+    .edge-hit { fill:none; stroke:transparent; stroke-width:12; vector-effect:non-scaling-stroke; pointer-events:stroke; cursor:pointer; }
+    .edge-jump { fill:transparent; pointer-events:all; cursor:pointer; }
+    .node { cursor:pointer; }
+    .box { stroke:#758191; stroke-width:1; }
+    .node.held .box { stroke-dasharray:5 3; }
+    .node.near .box { stroke:#c18221; stroke-width:2; }
+    .node.focus .box { stroke:#9c4900; stroke-width:3; }
+    .node.selected .box { stroke:#1569b9; stroke-width:3; }
+    .node.folded .box { stroke-width:4; }
+    .node.folding .box { fill:#f4ccd7; }
+    .fold-tag { font-size:9px; font-weight:700; fill:#963751; }
+    .peep-area { fill:#fff3d9; fill-opacity:.8; stroke:#c18221; stroke-width:2; pointer-events:none; }
+    .node.peep-edit .box { stroke:#9c4900; stroke-width:3; }
+    .node.error .box { stroke:#b42318; stroke-width:4; }
+    #event.error { color:#b42318; font-weight:600; white-space:pre-wrap; overflow-wrap:anywhere; }
+    .peep-ghosts { pointer-events:none; }
+    .region-box { stroke:#9da9b8; stroke-width:1.5; }
+    .fold-btn { cursor:pointer; }
+    .fold-btn rect { fill:white; stroke:#596674; }
+    .fold-btn text { font-size:14px; fill:#152330; }
+    .fold-btn:focus rect { stroke:#1569b9; stroke-width:2; }
+    .shortcut { cursor:pointer; }
+    .shortcut path { fill:none; stroke-width:1.5; }
+    .shortcut rect { fill:#fff8ec; stroke:#b63838; stroke-dasharray:3 2; }
+    .shortcut text { font-size:11px; fill:#783030; }
+    .shortcut.selected rect, .shortcut:focus rect { stroke-width:2.5; }
+    .label { font-size:12px; fill:#152330; font-weight:600; }
+    .node-id { font-size:10px; fill:#596674; font-weight:400; }
+    .type { font-size:11px; fill:#455768; }
+    .port { stroke:#536477; stroke-width:1; }
+    .row { stroke:#b6afcf; stroke-width:1; }
+    .bind { font-size:12px; fill:#152330; }
+    .slot { font-size:10px; fill:#364352; paint-order:stroke; stroke:#fafbfc; stroke-width:3; }
+    #detail { position:absolute; top:8px; right:8px; margin:0; padding:12px; max-width:320px;
+      max-height:45%; overflow:auto; white-space:pre-wrap; overflow-wrap:anywhere;
+      background:#fffffff2; border:1px solid #bac5d0; border-radius:4px; font-size:12px; }
+    .controls { display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:6px; padding:6px; }
+    .button { color:white; background:black; font-size:20px; min-width:30px; }
+    .button:disabled { background:grey; }
+    .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="637" height="410" fill="#f1f6fc"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e3i0" d="M246,687 C246,711 420.5,714 420.5,738" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #17 · CTRL</title></path><path class="edge CTRL" id="e6i1" d="M126,118 L126,241" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#6[1] → #1 · CTRL</title></path><path class="edge CTRL" id="e6i2" d="M106,546 L106,556 L649,556 L649,224 L156,224 L156,244" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#6[2] → #5 · CTRL</title></path><path class="edge DATA" id="e8i1" d="M246,118 L246,128 L258,128 L258,241" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#8[1] → #4 · DATA</title></path><path class="edge DATA" id="e8i2" d="M525,398 L525,408 L639,408 L639,232 L298,232 L298,244" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#8[2] → #16 · DATA</title></path><path class="edge DATA" id="e10i1" d="M278,297 L278,317 L373,317 L373,345" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[1] → #8 · DATA</title></path><path class="edge DATA" id="e10i2" d="M605,118 L605,307 L403,307 L403,345" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[2] → #9 · DATA</title></path><path class="edge CTRL" id="e11i0" d="M126,297 L126,449" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#11[0] → #6 · CTRL</title></path><path class="edge DATA" id="e11i1" d="M373,401 L373,411 L206,411 L206,449" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#11[1] → #10 · DATA</title></path><path class="edge DATA" id="e16i1" d="M278,297 L278,317 L525,317 L525,345" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[1] → #8 · DATA</title></path><path class="edge DATA" id="e16i2" d="M757,118 L757,128 L616,128 L616,317 L555,317 L555,345" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#16[2] → #15 · DATA</title></path><path class="edge CTRL" id="e17i0" d="M226,549 L226,634" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#17[0] → #7 · CTRL</title></path><path class="edge DATA" id="e17i1" d="M278,297 L278,317 L302,317 L302,596 L266,596 L266,634" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#17[1] → #8 · 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(66,68)" 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
+
+[0] → #2  CTRL</title></g><g class="node" id="n2" data-id="2" transform="translate(66,24)" 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(384.5,738)" 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
+Type not computed
+
+[0] → #17  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(186,68)" 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">  #4/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 arg
+Projection 1 of #2
+Type not computed
+
+[0] → #2  DATA</title></g><g class="node" id="n5" data-id="5" transform="translate(46,499)" 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">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 True
+Projection 0 of #11
+Type not computed
+
+[0] → #11  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(66,247)" 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">  #6</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 Loop
+Type not computed
+
+[0] → —  DATA
+[1] → #1  CTRL
+[2] → #5  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="n7" data-id="7" transform="translate(166,499)" 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">  #7/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 False
+Projection 1 of #11
+Type not computed
+
+[0] → #11  CTRL</title></g><g class="node" id="n8" data-id="8" transform="translate(218,247)" 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">  #8</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 φ_arg
+Type not computed
+
+[0] → #6  ASSOC
+[1] → #4  DATA
+[2] → #16  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] → #6</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="n9" data-id="9" transform="translate(545,68)" 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>10</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 10
+Type not computed
+
+</title></g><g class="node" id="n10" data-id="10" transform="translate(313,351)" 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">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 &lt;
+Type not computed
+
+[0] → —  DATA
+[1] → #8  DATA
+[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="n11" data-id="11" transform="translate(46,455)" 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">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#11 If
+Type not computed
+
+[0] → #6  CTRL
+[1] → #10  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="n15" data-id="15" transform="translate(697,68)" 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>1</tspan><tspan class="node-id">  #15</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#15 1
+Type not computed
+
+</title></g><g class="node" id="n16" data-id="16" transform="translate(465,351)" 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">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 +
+Type not computed
+
+[0] → —  DATA
+[1] → #8  DATA
+[2] → #15  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(186,640)" 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">  #17</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#17 Return
+Type not computed
+
+[0] → #7  CTRL
+[1] → #8  DATA</title><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="40" y="-10" text-anchor="middle">0</text><text class="slot" x="80" y="-10" text-anchor="middle">1</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(24,171)"><text class="label" x="26" y="17"><tspan>Loop</tspan><tspan class="node-id">  #6</tspan></text><title>Loop · 7 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #6"><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>
diff --git a/chapter07/docs/07-graph3.json b/chapter07/docs/07-graph3.json
new file mode 100644
index 00000000..26dbc457
--- /dev/null
+++ b/chapter07/docs/07-graph3.json
@@ -0,0 +1,40 @@
+{
+  "ver": 1,
+  "comp": "chapter07/docs/07-graph3.svg",
+  "step": 1,
+  "roots": [],
+  "scope": 0,
+  "nodes": [
+    {"id": 1, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
+    {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
+    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 35, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 4, "label": "arg", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 2, "role": "DATA", "label": null}], "proj": {"par": 2, "idx": 1}},
+    {"id": 5, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 14, "role": "CTRL", "label": null}], "proj": {"par": 14, "idx": 0}},
+    {"id": 6, "label": "0", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 7, "label": "0", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 8, "label": "Loop", "type": null, "kind": "LOOP", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 1, "role": "CTRL", "label": null}, {"idx": 2, "def": 15, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 9, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 14, "role": "CTRL", "label": null}], "proj": {"par": 14, "idx": 1}},
+    {"id": 10, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 28, "role": "CTRL", "label": null}], "proj": {"par": 28, "idx": 0}},
+    {"id": 11, "label": "φ_sum", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 8, "role": "ASSOC", "label": null}, {"idx": 1, "def": 6, "role": "DATA", "label": null}, {"idx": 2, "def": 24, "role": "DATA", "label": null}], "proj": null},
+    {"id": 12, "label": "φ_i", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 8, "role": "ASSOC", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 19, "role": "DATA", "label": null}], "proj": null},
+    {"id": 13, "label": "<", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 12, "role": "DATA", "label": null}, {"idx": 2, "def": 4, "role": "DATA", "label": null}], "proj": null},
+    {"id": 14, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 8, "role": "CTRL", "label": null}, {"idx": 1, "def": 13, "role": "DATA", "label": null}], "proj": null},
+    {"id": 15, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 28, "role": "CTRL", "label": null}], "proj": {"par": 28, "idx": 1}},
+    {"id": 18, "label": "1", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 19, "label": "+", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 12, "role": "DATA", "label": null}, {"idx": 2, "def": 18, "role": "DATA", "label": null}], "proj": null},
+    {"id": 20, "label": "0", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 21, "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": 10, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 24, "label": "φ_sum", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 21, "role": "ASSOC", "label": null}, {"idx": 1, "def": 11, "role": "DATA", "label": null}, {"idx": 2, "def": 32, "role": "DATA", "label": null}], "proj": null},
+    {"id": 26, "label": "φ_j", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 21, "role": "ASSOC", "label": null}, {"idx": 1, "def": 20, "role": "DATA", "label": null}, {"idx": 2, "def": 34, "role": "DATA", "label": null}], "proj": null},
+    {"id": 27, "label": "<", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 26, "role": "DATA", "label": null}, {"idx": 2, "def": 4, "role": "DATA", "label": null}], "proj": null},
+    {"id": 28, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 21, "role": "CTRL", "label": null}, {"idx": 1, "def": 27, "role": "DATA", "label": null}], "proj": null},
+    {"id": 32, "label": "+", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 26, "role": "DATA", "label": null}, {"idx": 2, "def": 24, "role": "DATA", "label": null}], "proj": null},
+    {"id": 33, "label": "1", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 34, "label": "+", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 26, "role": "DATA", "label": null}, {"idx": 2, "def": 33, "role": "DATA", "label": null}], "proj": null},
+    {"id": 35, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 9, "role": "CTRL", "label": null}, {"idx": 1, "def": 11, "role": "DATA", "label": null}], "proj": null}
+  ],
+  "groups": [
+    {"id": 8, "par": 0, "nodes": [5, 8, 9, 11, 12, 13, 14, 19]},
+    {"id": 21, "par": 8, "nodes": [10, 15, 21, 24, 26, 27, 28, 32, 34]}
+  ]
+}
diff --git a/chapter07/docs/07-graph3.svg b/chapter07/docs/07-graph3.svg
index a9a0e8d0..181b72a9 100644
--- a/chapter07/docs/07-graph3.svg
+++ b/chapter07/docs/07-graph3.svg
@@ -1,373 +1,175 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: chapter07 Pages: 1 -->
-<svg width="462pt" height="592pt"
- viewBox="0.00 0.00 462.00 592.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 588)">
-<title>chapter07</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-588 458,-588 458,4 -4,4"/>
-<g id="clust1" class="cluster">
-<title>cluster_Nodes</title>
-<polygon fill="none" stroke="black" points="8,-8 8,-576 446,-576 446,-8 8,-8"/>
-</g>
-<!-- Start2 -->
-<g id="node1" class="node">
-<title>Start2</title>
-<polygon fill="yellow" stroke="transparent" points="148,-539 148,-564 229,-564 229,-539 148,-539"/>
-<polygon fill="none" stroke="black" points="148,-539 148,-564 229,-564 229,-539 148,-539"/>
-<text text-anchor="start" x="170" y="-547.8" font-family="Times,serif" font-size="14.00">Start</text>
-<polygon fill="none" stroke="black" points="148,-508 148,-539 229,-539 229,-508 148,-508"/>
-<polygon fill="yellow" stroke="transparent" points="153,-513 153,-534 193,-534 193,-513 153,-513"/>
-<polygon fill="none" stroke="black" points="153,-513 153,-534 193,-534 193,-513 153,-513"/>
-<text text-anchor="start" x="156" y="-519.8" font-family="Times,serif" font-size="14.00">$ctrl</text>
-<polygon fill="none" stroke="black" points="193,-513 193,-534 224,-534 224,-513 193,-513"/>
-<text text-anchor="start" x="196" y="-519.8" font-family="Times,serif" font-size="14.00">arg</text>
-</g>
-<!-- Stop3 -->
-<g id="node2" class="node">
-<title>Stop3</title>
-<polygon fill="yellow" stroke="black" points="432,-152 378,-152 378,-116 432,-116 432,-152"/>
-<text text-anchor="middle" x="405" y="-130.3" font-family="Times,serif" font-size="14.00">Stop</text>
-</g>
-<!-- Return35 -->
-<g id="node21" class="node">
-<title>Return35</title>
-<polygon fill="yellow" stroke="black" points="438,-224 372,-224 372,-188 438,-188 438,-224"/>
-<text text-anchor="middle" x="405" y="-202.3" font-family="Times,serif" font-size="14.00">Return</text>
-</g>
-<!-- Stop3&#45;&gt;Return35 -->
-<g id="edge1" class="edge">
-<title>Stop3&#45;&gt;Return35</title>
-<path fill="none" stroke="red" d="M405,-152.3C405,-160.02 405,-169.29 405,-177.89"/>
-<polygon fill="red" stroke="red" points="401.5,-177.9 405,-187.9 408.5,-177.9 401.5,-177.9"/>
-<text text-anchor="middle" x="402" y="-154.9" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Con_6 -->
-<g id="node3" class="node">
-<title>Con_6</title>
-<ellipse fill="none" stroke="black" cx="94" cy="-536" rx="27" ry="18"/>
-<text text-anchor="middle" x="94" y="-532.3" font-family="Times,serif" font-size="14.00">0</text>
-</g>
-<!-- Con_7 -->
-<g id="node4" class="node">
-<title>Con_7</title>
-<ellipse fill="none" stroke="black" cx="282" cy="-536" rx="27" ry="18"/>
-<text text-anchor="middle" x="282" y="-532.3" font-family="Times,serif" font-size="14.00">0</text>
-</g>
-<!-- Loop8 -->
-<g id="node5" class="node">
-<title>Loop8</title>
-<polygon fill="yellow" stroke="black" points="426,-468 372,-468 372,-432 426,-432 426,-468"/>
-<text text-anchor="middle" x="399" y="-446.3" font-family="Times,serif" font-size="14.00">Loop</text>
-</g>
-<!-- Loop8&#45;&gt;Start2 -->
-<g id="edge2" class="edge">
-<title>Loop8&#45;&gt;Start2:p0</title>
-<path fill="none" stroke="red" d="M371.74,-464.61C368.82,-465.84 365.87,-467 363,-468 325.58,-481 197.82,-470.79 176.14,-502.03"/>
-<polygon fill="red" stroke="red" points="172.67,-501.41 173,-512 179.34,-503.51 172.67,-501.41"/>
-<text text-anchor="middle" x="368.74" y="-458.21" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- If28 -->
-<g id="node17" class="node">
-<title>If28</title>
-<polygon fill="yellow" stroke="transparent" points="142,-51 142,-76 236,-76 236,-51 142,-51"/>
-<polygon fill="none" stroke="black" points="142,-51 142,-76 236,-76 236,-51 142,-51"/>
-<text text-anchor="start" x="183.5" y="-59.8" font-family="Times,serif" font-size="14.00">If</text>
-<polygon fill="none" stroke="black" points="142,-20 142,-51 236,-51 236,-20 142,-20"/>
-<polygon fill="yellow" stroke="transparent" points="147,-25 147,-46 187,-46 187,-25 147,-25"/>
-<polygon fill="none" stroke="black" points="147,-25 147,-46 187,-46 187,-25 147,-25"/>
-<text text-anchor="start" x="150" y="-31.8" font-family="Times,serif" font-size="14.00">True</text>
-<polygon fill="yellow" stroke="transparent" points="187,-25 187,-46 231,-46 231,-25 187,-25"/>
-<polygon fill="none" stroke="black" points="187,-25 187,-46 231,-46 231,-25 187,-25"/>
-<text text-anchor="start" x="190" y="-31.8" font-family="Times,serif" font-size="14.00">False</text>
-</g>
-<!-- Loop8&#45;&gt;If28 -->
-<g id="edge3" class="edge">
-<title>Loop8&#45;&gt;If28:p1</title>
-<path fill="none" stroke="red" d="M371.72,-435.44C368.81,-434.2 365.86,-433.02 363,-432 300.87,-409.81 259.6,-448 219,-396 176.78,-341.93 243.11,-308.12 292,-260 311.77,-240.54 330.24,-248.63 343,-224 350.36,-209.79 353.65,-199.94 343,-188 248.88,-82.54 121.12,-257.46 27,-152 16.35,-140.06 16.65,-128.2 27,-116 90.22,-41.43 180.78,-154.57 244,-80 259.81,-61.35 261.04,-42.53 244,-25 236.29,-17.07 221.85,-12.04 214.15,-15.39"/>
-<polygon fill="red" stroke="red" points="211.13,-13.62 209,-24 217.14,-17.22 211.13,-13.62"/>
-<text text-anchor="middle" x="368.72" y="-429.04" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_sum11 -->
-<g id="node6" class="node">
-<title>Phi_sum11</title>
-<ellipse fill="lightyellow" stroke="black" cx="149" cy="-450" rx="40.89" ry="18"/>
-<text text-anchor="middle" x="149" y="-446.3" font-family="Times,serif" font-size="14.00">φ_sum</text>
-</g>
-<!-- Phi_sum11&#45;&gt;Con_6 -->
-<g id="edge5" class="edge">
-<title>Phi_sum11&#45;&gt;Con_6</title>
-<path fill="none" stroke="black" d="M138.13,-467.6C130.07,-479.91 118.95,-496.89 109.89,-510.73"/>
-<polygon fill="black" stroke="black" points="106.84,-509.01 104.29,-519.29 112.69,-512.84 106.84,-509.01"/>
-<text text-anchor="middle" x="135.13" y="-470.2" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_sum11&#45;&gt;Loop8 -->
-<g id="edge4" class="edge">
-<title>Phi_sum11&#45;&gt;Loop8</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M173.66,-435.44C188.78,-427.38 208.85,-418.16 228,-414 282.73,-402.12 301.16,-395.46 354,-414 361.14,-416.5 367.99,-420.67 374.09,-425.3"/>
-<polygon fill="black" stroke="black" points="371.99,-428.1 381.92,-431.78 376.45,-422.71 371.99,-428.1"/>
-<text text-anchor="middle" x="170.66" y="-429.04" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Phi_sum24 -->
-<g id="node14" class="node">
-<title>Phi_sum24</title>
-<ellipse fill="lightyellow" stroke="black" cx="149" cy="-206" rx="40.89" ry="18"/>
-<text text-anchor="middle" x="149" y="-202.3" font-family="Times,serif" font-size="14.00">φ_sum</text>
-</g>
-<!-- Phi_i12 -->
-<g id="node7" class="node">
-<title>Phi_i12</title>
-<ellipse fill="lightyellow" stroke="black" cx="255" cy="-450" rx="27" ry="18"/>
-<text text-anchor="middle" x="255" y="-446.3" font-family="Times,serif" font-size="14.00">φ_i</text>
-</g>
-<!-- Phi_i12&#45;&gt;Con_7 -->
-<g id="edge8" class="edge">
-<title>Phi_i12&#45;&gt;Con_7</title>
-<path fill="none" stroke="black" d="M260.46,-468C264.22,-479.69 269.28,-495.44 273.56,-508.73"/>
-<polygon fill="black" stroke="black" points="270.24,-509.86 276.64,-518.31 276.91,-507.72 270.24,-509.86"/>
-<text text-anchor="middle" x="257.46" y="-470.6" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_i12&#45;&gt;Loop8 -->
-<g id="edge7" class="edge">
-<title>Phi_i12&#45;&gt;Loop8</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M269.22,-434.43C277.37,-426.68 288.29,-418.11 300,-414 322.65,-406.06 331.35,-406.06 354,-414 361.14,-416.5 367.99,-420.67 374.09,-425.3"/>
-<polygon fill="black" stroke="black" points="371.99,-428.1 381.92,-431.78 376.45,-422.71 371.99,-428.1"/>
-<text text-anchor="middle" x="266.22" y="-428.03" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Add19 -->
-<g id="node11" class="node">
-<title>Add19</title>
-<ellipse fill="none" stroke="black" cx="327" cy="-378" rx="27" ry="18"/>
-<text text-anchor="middle" x="327" y="-374.3" font-family="Times,serif" font-size="14.00">+</text>
-</g>
-<!-- LT13 -->
-<g id="node8" class="node">
-<title>LT13</title>
-<ellipse fill="none" stroke="black" cx="255" cy="-378" rx="27" ry="18"/>
-<text text-anchor="middle" x="255" y="-374.3" font-family="Times,serif" font-size="14.00">&lt;</text>
-</g>
-<!-- LT13&#45;&gt;Start2 -->
-<g id="edge11" class="edge">
-<title>LT13&#45;&gt;Start2:p1</title>
-<path fill="none" stroke="black" d="M241.85,-394.14C233.87,-404.19 224.26,-418.05 219,-432 207.64,-462.12 208.62,-473.77 208.94,-501.81"/>
-<polygon fill="black" stroke="black" points="205.44,-502.02 209,-512 212.44,-501.98 205.44,-502.02"/>
-<text text-anchor="middle" x="238.85" y="-396.74" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- LT13&#45;&gt;Phi_i12 -->
-<g id="edge10" class="edge">
-<title>LT13&#45;&gt;Phi_i12</title>
-<path fill="none" stroke="black" d="M255,-396.3C255,-404.02 255,-413.29 255,-421.89"/>
-<polygon fill="black" stroke="black" points="251.5,-421.9 255,-431.9 258.5,-421.9 251.5,-421.9"/>
-<text text-anchor="middle" x="252" y="-398.9" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- If14 -->
-<g id="node9" class="node">
-<title>If14</title>
-<polygon fill="yellow" stroke="transparent" points="309,-295 309,-320 403,-320 403,-295 309,-295"/>
-<polygon fill="none" stroke="black" points="309,-295 309,-320 403,-320 403,-295 309,-295"/>
-<text text-anchor="start" x="350.5" y="-303.8" font-family="Times,serif" font-size="14.00">If</text>
-<polygon fill="none" stroke="black" points="309,-264 309,-295 403,-295 403,-264 309,-264"/>
-<polygon fill="yellow" stroke="transparent" points="314,-269 314,-290 354,-290 354,-269 314,-269"/>
-<polygon fill="none" stroke="black" points="314,-269 314,-290 354,-290 354,-269 314,-269"/>
-<text text-anchor="start" x="317" y="-275.8" font-family="Times,serif" font-size="14.00">True</text>
-<polygon fill="yellow" stroke="transparent" points="354,-269 354,-290 398,-290 398,-269 354,-269"/>
-<polygon fill="none" stroke="black" points="354,-269 354,-290 398,-290 398,-269 354,-269"/>
-<text text-anchor="start" x="357" y="-275.8" font-family="Times,serif" font-size="14.00">False</text>
-</g>
-<!-- If14&#45;&gt;Loop8 -->
-<g id="edge12" class="edge">
-<title>If14&#45;&gt;Loop8</title>
-<path fill="none" stroke="red" d="M364.6,-324.19C372.47,-352.77 384.02,-394.64 391.52,-421.86"/>
-<polygon fill="red" stroke="red" points="388.24,-423.15 394.27,-431.86 394.99,-421.29 388.24,-423.15"/>
-<text text-anchor="middle" x="361.6" y="-326.79" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- If14&#45;&gt;LT13 -->
-<g id="edge13" class="edge">
-<title>If14&#45;&gt;LT13</title>
-<path fill="none" stroke="black" d="M318.68,-324.04C305.44,-335.05 290.9,-347.14 279.06,-356.99"/>
-<polygon fill="black" stroke="black" points="276.79,-354.32 271.34,-363.41 281.27,-359.7 276.79,-354.32"/>
-<text text-anchor="middle" x="315.68" y="-326.64" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Con_18 -->
-<g id="node10" class="node">
-<title>Con_18</title>
-<ellipse fill="none" stroke="black" cx="327" cy="-450" rx="27" ry="18"/>
-<text text-anchor="middle" x="327" y="-446.3" font-family="Times,serif" font-size="14.00">1</text>
-</g>
-<!-- Add19&#45;&gt;Phi_i12 -->
-<g id="edge14" class="edge">
-<title>Add19&#45;&gt;Phi_i12</title>
-<path fill="none" stroke="black" d="M304.96,-400.43C296.13,-409.01 285.99,-418.87 277.15,-427.46"/>
-<polygon fill="black" stroke="black" points="307.7,-402.65 312.43,-393.17 302.82,-397.63 307.7,-402.65"/>
-<polygon fill="black" stroke="black" points="274.53,-425.13 269.8,-434.62 279.41,-430.15 274.53,-425.13"/>
-<text text-anchor="middle" x="309.43" y="-395.77" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Add19&#45;&gt;Con_18 -->
-<g id="edge15" class="edge">
-<title>Add19&#45;&gt;Con_18</title>
-<path fill="none" stroke="black" d="M327,-396.3C327,-404.02 327,-413.29 327,-421.89"/>
-<polygon fill="black" stroke="black" points="323.5,-421.9 327,-431.9 330.5,-421.9 323.5,-421.9"/>
-<text text-anchor="middle" x="324" y="-398.9" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Con_20 -->
-<g id="node12" class="node">
-<title>Con_20</title>
-<ellipse fill="none" stroke="black" cx="63" cy="-292" rx="27" ry="18"/>
-<text text-anchor="middle" x="63" y="-288.3" font-family="Times,serif" font-size="14.00">0</text>
-</g>
-<!-- Loop21 -->
-<g id="node13" class="node">
-<title>Loop21</title>
-<polygon fill="yellow" stroke="black" points="334,-224 280,-224 280,-188 334,-188 334,-224"/>
-<text text-anchor="middle" x="307" y="-202.3" font-family="Times,serif" font-size="14.00">Loop</text>
-</g>
-<!-- Loop21&#45;&gt;If14 -->
-<g id="edge16" class="edge">
-<title>Loop21&#45;&gt;If14:p0</title>
-<path fill="none" stroke="red" d="M319.08,-224C324.75,-233.3 330.76,-245.44 333.05,-257.94"/>
-<polygon fill="red" stroke="red" points="329.57,-258.38 334,-268 336.54,-257.71 329.57,-258.38"/>
-<text text-anchor="middle" x="316.08" y="-226.6" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Loop21&#45;&gt;If28 -->
-<g id="edge17" class="edge">
-<title>Loop21&#45;&gt;If28:p0</title>
-<path fill="none" stroke="red" d="M279.81,-191.15C276.88,-189.96 273.91,-188.88 271,-188 218.54,-172.13 62.82,-193.49 27,-152 -19.29,-98.38 63.73,-40.46 135.9,-35.36"/>
-<polygon fill="red" stroke="red" points="136.13,-38.86 146,-35 135.88,-31.86 136.13,-38.86"/>
-<text text-anchor="middle" x="276.81" y="-184.75" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_sum24&#45;&gt;Phi_sum11 -->
-<g id="edge19" class="edge">
-<title>Phi_sum24&#45;&gt;Phi_sum11</title>
-<path fill="none" stroke="black" d="M149,-234.1C149,-280.5 149,-374.66 149,-421.4"/>
-<polygon fill="black" stroke="black" points="152.5,-234.02 149,-224.02 145.5,-234.02 152.5,-234.02"/>
-<polygon fill="black" stroke="black" points="145.5,-421.68 149,-431.68 152.5,-421.68 145.5,-421.68"/>
-<text text-anchor="middle" x="146" y="-226.62" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_sum24&#45;&gt;Loop21 -->
-<g id="edge18" class="edge">
-<title>Phi_sum24&#45;&gt;Loop21</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M168.72,-190.18C179.62,-182.46 193.79,-173.99 208,-170 231.11,-163.51 239.35,-162.06 262,-170 269.14,-172.5 275.99,-176.67 282.09,-181.3"/>
-<polygon fill="black" stroke="black" points="279.99,-184.1 289.92,-187.78 284.45,-178.71 279.99,-184.1"/>
-<text text-anchor="middle" x="165.72" y="-183.78" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Add32 -->
-<g id="node18" class="node">
-<title>Add32</title>
-<ellipse fill="none" stroke="black" cx="142" cy="-134" rx="27" ry="18"/>
-<text text-anchor="middle" x="142" y="-130.3" font-family="Times,serif" font-size="14.00">+</text>
-</g>
-<!-- Phi_j26 -->
-<g id="node15" class="node">
-<title>Phi_j26</title>
-<ellipse fill="lightyellow" stroke="black" cx="63" cy="-206" rx="27" ry="18"/>
-<text text-anchor="middle" x="63" y="-202.3" font-family="Times,serif" font-size="14.00">φ_j</text>
-</g>
-<!-- Phi_j26&#45;&gt;Con_20 -->
-<g id="edge22" class="edge">
-<title>Phi_j26&#45;&gt;Con_20</title>
-<path fill="none" stroke="black" d="M63,-224.4C63,-235.74 63,-250.77 63,-263.68"/>
-<polygon fill="black" stroke="black" points="59.5,-263.9 63,-273.9 66.5,-263.9 59.5,-263.9"/>
-<text text-anchor="middle" x="60" y="-227" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_j26&#45;&gt;Loop21 -->
-<g id="edge21" class="edge">
-<title>Phi_j26&#45;&gt;Loop21</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M77.22,-190.43C85.37,-182.68 96.29,-174.11 108,-170 172.59,-147.34 197.41,-147.34 262,-170 269.14,-172.5 275.99,-176.67 282.09,-181.3"/>
-<polygon fill="black" stroke="black" points="279.99,-184.1 289.92,-187.78 284.45,-178.71 279.99,-184.1"/>
-<text text-anchor="middle" x="74.22" y="-184.03" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Add34 -->
-<g id="node20" class="node">
-<title>Add34</title>
-<ellipse fill="none" stroke="black" cx="225" cy="-134" rx="27" ry="18"/>
-<text text-anchor="middle" x="225" y="-130.3" font-family="Times,serif" font-size="14.00">+</text>
-</g>
-<!-- LT27 -->
-<g id="node16" class="node">
-<title>LT27</title>
-<ellipse fill="none" stroke="black" cx="63" cy="-134" rx="27" ry="18"/>
-<text text-anchor="middle" x="63" y="-130.3" font-family="Times,serif" font-size="14.00">&lt;</text>
-</g>
-<!-- LT27&#45;&gt;Start2 -->
-<g id="edge25" class="edge">
-<title>LT27&#45;&gt;Start2:p1</title>
-<path fill="none" stroke="black" d="M49.72,-150.09C41.69,-160.12 32.07,-173.98 27,-188 11.37,-231.26 17,-245.01 17,-291 17,-291 17,-291 17,-379 17,-432.79 54.71,-437.48 99,-468 139.14,-495.66 199.24,-464.69 207.94,-501.72"/>
-<polygon fill="black" stroke="black" points="204.49,-502.41 209,-512 211.45,-501.69 204.49,-502.41"/>
-<text text-anchor="middle" x="46.72" y="-152.69" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- LT27&#45;&gt;Phi_j26 -->
-<g id="edge24" class="edge">
-<title>LT27&#45;&gt;Phi_j26</title>
-<path fill="none" stroke="black" d="M63,-152.3C63,-160.02 63,-169.29 63,-177.89"/>
-<polygon fill="black" stroke="black" points="59.5,-177.9 63,-187.9 66.5,-177.9 59.5,-177.9"/>
-<text text-anchor="middle" x="60" y="-154.9" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- If28&#45;&gt;Loop21 -->
-<g id="edge26" class="edge">
-<title>If28&#45;&gt;Loop21</title>
-<path fill="none" stroke="red" d="M227.35,-80.17C239.01,-90.79 251.3,-103.21 261,-116 275.71,-135.38 288.07,-160.15 296.27,-178.63"/>
-<polygon fill="red" stroke="red" points="293.1,-180.12 300.27,-187.92 299.53,-177.35 293.1,-180.12"/>
-<text text-anchor="middle" x="224.35" y="-82.77" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- If28&#45;&gt;LT27 -->
-<g id="edge27" class="edge">
-<title>If28&#45;&gt;LT27</title>
-<path fill="none" stroke="black" d="M142.44,-80.04C124.74,-91.84 105.18,-104.88 89.9,-115.07"/>
-<polygon fill="black" stroke="black" points="87.82,-112.24 81.44,-120.7 91.71,-118.07 87.82,-112.24"/>
-<text text-anchor="middle" x="139.44" y="-82.64" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Add32&#45;&gt;Phi_sum24 -->
-<g id="edge29" class="edge">
-<title>Add32&#45;&gt;Phi_sum24</title>
-<path fill="none" stroke="black" d="M144.73,-162.33C145.24,-167.45 145.78,-172.79 146.29,-177.9"/>
-<polygon fill="black" stroke="black" points="148.21,-161.91 143.73,-152.3 141.24,-162.6 148.21,-161.91"/>
-<polygon fill="black" stroke="black" points="142.81,-178.29 147.29,-187.9 149.78,-177.6 142.81,-178.29"/>
-<text text-anchor="middle" x="140.73" y="-154.9" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Add32&#45;&gt;Phi_j26 -->
-<g id="edge28" class="edge">
-<title>Add32&#45;&gt;Phi_j26</title>
-<path fill="none" stroke="black" d="M126.39,-148.83C114.92,-158.99 99.15,-172.97 86.21,-184.44"/>
-<polygon fill="black" stroke="black" points="83.74,-181.95 78.58,-191.2 88.38,-187.19 83.74,-181.95"/>
-<text text-anchor="middle" x="123.39" y="-151.43" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Con_33 -->
-<g id="node19" class="node">
-<title>Con_33</title>
-<ellipse fill="none" stroke="black" cx="235" cy="-206" rx="27" ry="18"/>
-<text text-anchor="middle" x="235" y="-202.3" font-family="Times,serif" font-size="14.00">1</text>
-</g>
-<!-- Add34&#45;&gt;Phi_j26 -->
-<g id="edge30" class="edge">
-<title>Add34&#45;&gt;Phi_j26</title>
-<path fill="none" stroke="black" d="M193.01,-148.01C167.45,-158.51 130.76,-173.83 99,-188 97.2,-188.8 95.36,-189.64 93.5,-190.49"/>
-<polygon fill="black" stroke="black" points="194.64,-151.12 202.57,-144.09 191.99,-144.65 194.64,-151.12"/>
-<polygon fill="black" stroke="black" points="91.85,-187.39 84.25,-194.78 94.79,-193.74 91.85,-187.39"/>
-<text text-anchor="middle" x="199.57" y="-146.69" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Add34&#45;&gt;Con_33 -->
-<g id="edge31" class="edge">
-<title>Add34&#45;&gt;Con_33</title>
-<path fill="none" stroke="black" d="M227.42,-151.95C228.52,-159.65 229.85,-168.97 231.09,-177.64"/>
-<polygon fill="black" stroke="black" points="227.65,-178.32 232.53,-187.72 234.58,-177.33 227.65,-178.32"/>
-<text text-anchor="middle" x="224.42" y="-154.55" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Return35&#45;&gt;Phi_sum11 -->
-<g id="edge33" class="edge">
-<title>Return35&#45;&gt;Phi_sum11</title>
-<path fill="none" stroke="black" d="M371.93,-220.42C343.47,-232.34 305.01,-249.46 292,-260 233.39,-307.47 185.4,-383.86 162.87,-423.42"/>
-<polygon fill="black" stroke="black" points="159.79,-421.75 157.95,-432.19 165.89,-425.18 159.79,-421.75"/>
-<text text-anchor="middle" x="368.93" y="-214.02" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Return35&#45;&gt;If14 -->
-<g id="edge32" class="edge">
-<title>Return35&#45;&gt;If14:p1</title>
-<path fill="none" stroke="red" d="M391.86,-224.13C385.8,-233.37 379.43,-245.41 377.01,-257.92"/>
-<polygon fill="red" stroke="red" points="373.52,-257.7 376,-268 380.48,-258.4 373.52,-257.7"/>
-<text text-anchor="middle" x="388.86" y="-226.73" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-</g>
-</svg>
+<svg aria-label="Compiler graph" width="1334" height="1332" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1334 1332" 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; }
+    #program { width:min(600px,80vw); vertical-align:middle; }
+    #status { margin-top:4px; }
+    #graph { min-height:0; overflow:hidden; position:relative; background:#fafbfc; }
+    #elk { width:100%; height:100%; }
+    #graph svg { display:block; }
+    .tools { display:flex; flex-wrap:wrap; align-items:center; gap:14px; margin-top:8px; font-size:12px; }
+    .hint { color:#616c78; }
+    .ctrl { color:#b63838; } .mem { color:#2867b2; } .data { color:#536477; }
+    .edge { fill:none; stroke-width:1.5; }
+    .edge.CTRL { stroke-width:2; }
+    .edge.ASSOC { stroke-dasharray:4 4; }
+    .edge.PARSER { stroke-dasharray:5 4; }
+    .parser rect { fill:#f6f0ff; stroke:#7956a5; stroke-width:1.5; stroke-dasharray:5 4; }
+    .edge.selected { stroke-width:3.5; }
+    .edge.bundle { stroke-width:4; }
+    .edge.bundle.selected { stroke-width:6; }
+    .edge-hit { fill:none; stroke:transparent; stroke-width:12; vector-effect:non-scaling-stroke; pointer-events:stroke; cursor:pointer; }
+    .edge-jump { fill:transparent; pointer-events:all; cursor:pointer; }
+    .node { cursor:pointer; }
+    .box { stroke:#758191; stroke-width:1; }
+    .node.held .box { stroke-dasharray:5 3; }
+    .node.near .box { stroke:#c18221; stroke-width:2; }
+    .node.focus .box { stroke:#9c4900; stroke-width:3; }
+    .node.selected .box { stroke:#1569b9; stroke-width:3; }
+    .node.folded .box { stroke-width:4; }
+    .node.folding .box { fill:#f4ccd7; }
+    .fold-tag { font-size:9px; font-weight:700; fill:#963751; }
+    .peep-area { fill:#fff3d9; fill-opacity:.8; stroke:#c18221; stroke-width:2; pointer-events:none; }
+    .node.peep-edit .box { stroke:#9c4900; stroke-width:3; }
+    .node.error .box { stroke:#b42318; stroke-width:4; }
+    #event.error { color:#b42318; font-weight:600; white-space:pre-wrap; overflow-wrap:anywhere; }
+    .peep-ghosts { pointer-events:none; }
+    .region-box { stroke:#9da9b8; stroke-width:1.5; }
+    .fold-btn { cursor:pointer; }
+    .fold-btn rect { fill:white; stroke:#596674; }
+    .fold-btn text { font-size:14px; fill:#152330; }
+    .fold-btn:focus rect { stroke:#1569b9; stroke-width:2; }
+    .shortcut { cursor:pointer; }
+    .shortcut path { fill:none; stroke-width:1.5; }
+    .shortcut rect { fill:#fff8ec; stroke:#b63838; stroke-dasharray:3 2; }
+    .shortcut text { font-size:11px; fill:#783030; }
+    .shortcut.selected rect, .shortcut:focus rect { stroke-width:2.5; }
+    .label { font-size:12px; fill:#152330; font-weight:600; }
+    .node-id { font-size:10px; fill:#596674; font-weight:400; }
+    .type { font-size:11px; fill:#455768; }
+    .port { stroke:#536477; stroke-width:1; }
+    .row { stroke:#b6afcf; stroke-width:1; }
+    .bind { font-size:12px; fill:#152330; }
+    .slot { font-size:10px; fill:#364352; paint-order:stroke; stroke:#fafbfc; stroke-width:3; }
+    #detail { position:absolute; top:8px; right:8px; margin:0; padding:12px; max-width:320px;
+      max-height:45%; overflow:auto; white-space:pre-wrap; overflow-wrap:anywhere;
+      background:#fffffff2; border:1px solid #bac5d0; border-radius:4px; font-size:12px; }
+    .controls { display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:6px; padding:6px; }
+    .button { color:white; background:black; font-size:20px; min-width:30px; }
+    .button:disabled { background:grey; }
+    .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(72,171)"><rect class="region-box" rx="8" width="1092" height="954" fill="#f1f6fc"/></g><g class="region" transform="translate(116,640)"><rect class="region-box" rx="8" width="666" height="438" fill="#f1f6fc"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e3i0" d="M812,1231 C812,1255 667,1258 667,1282" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #35 · CTRL</title></path><path class="edge CTRL" id="e8i1" d="M692,118 L692,279" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[1] → #1 · CTRL</title></path><path class="edge CTRL" id="e8i2" d="M328,1043 L328,1053 L1152,1053 L1152,254 L722,254 L722,282" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[2] → #15 · CTRL</title></path><path class="edge DATA" id="e11i1" d="M388,118 L388,138 L672,138 L672,259 L824,259 L824,279" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#11[1] → #6 · DATA</title></path><path class="edge DATA" id="e11i2" d="M380,791 L380,801 L1142,801 L1142,262 L864,262 L864,282" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#11[2] → #24 · DATA</title></path><path class="edge DATA" id="e12i1" d="M540,118 L540,128 L682,128 L682,239 L976,239 L976,279" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[1] → #7 · DATA</title></path><path class="edge DATA" id="e12i2" d="M844,436 L844,446 L1132,446 L1132,270 L1016,270 L1016,282" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[2] → #19 · DATA</title></path><path class="edge DATA" id="e13i1" d="M996,335 L996,383" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[1] → #12 · DATA</title></path><path class="edge DATA" id="e13i2" d="M812,118 L812,128 L1076,128 L1076,345 L1026,345 L1026,383" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[2] → #4 · DATA</title></path><path class="edge CTRL" id="e14i0" d="M692,335 L692,487" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#14[0] → #8 · CTRL</title></path><path class="edge DATA" id="e14i1" d="M996,439 L996,469 L772,469 L772,487" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[1] → #13 · DATA</title></path><path class="edge DATA" id="e19i1" d="M996,335 L996,355 L844,355 L844,383" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#19[1] → #12 · DATA</title></path><path class="edge DATA" id="e19i2" d="M84,118 L84,365 L874,365 L874,383" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#19[2] → #18 · DATA</title></path><path class="edge CTRL" id="e21i1" d="M672,587 L672,597 L228,597 L228,738" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[1] → #5 · CTRL</title></path><path class="edge CTRL" id="e21i2" d="M208,1043 L208,1053 L770,1053 L770,713 L258,713 L258,741" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[2] → #10 · CTRL</title></path><path class="edge DATA" id="e24i1" d="M844,335 L844,345 L773,345 L773,459 L218,459 L218,708 L360,708 L360,738" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#24[1] → #11 · DATA</title></path><path class="edge DATA" id="e24i2" d="M334,895 L334,905 L760,905 L760,721 L400,721 L400,741" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#24[2] → #32 · DATA</title></path><path class="edge DATA" id="e26i1" d="M1098,118 L1098,607 L717,607 L717,708 L512,708 L512,738" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#26[1] → #20 · DATA</title></path><path class="edge DATA" id="e26i2" d="M627,895 L627,905 L750,905 L750,729 L552,729 L552,741" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#26[2] → #34 · DATA</title></path><path class="edge DATA" id="e27i1" d="M532,794 L532,804 L475,804 L475,842" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#27[1] → #26 · DATA</title></path><path class="edge DATA" id="e27i2" d="M812,118 L812,128 L1087,128 L1087,597 L707,597 L707,814 L505,814 L505,842" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#27[2] → #4 · DATA</title></path><path class="edge CTRL" id="e28i0" d="M228,794 L228,946" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#28[0] → #21 · CTRL</title></path><path class="edge DATA" id="e28i1" d="M475,898 L475,918 L308,918 L308,946" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#28[1] → #27 · DATA</title></path><path class="edge DATA" id="e32i1" d="M532,794 L532,804 L334,804 L334,842" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#32[1] → #26 · DATA</title></path><path class="edge DATA" id="e32i2" d="M380,794 L380,814 L364,814 L364,842" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#32[2] → #24 · DATA</title></path><path class="edge DATA" id="e34i1" d="M532,794 L532,804 L627,804 L627,842" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#34[1] → #26 · DATA</title></path><path class="edge DATA" id="e34i2" d="M1250,118 L1250,128 L1109,128 L1109,617 L727,617 L727,824 L657,824 L657,842" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#34[2] → #33 · DATA</title></path><path class="edge CTRL" id="e35i0" d="M792,587 L792,1178" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#35[0] → #9 · CTRL</title></path><path class="edge DATA" id="e35i1" d="M844,335 L844,345 L773,345 L773,459 L868,459 L868,1140 L832,1140 L832,1178" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#35[1] → #11 · 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(632,68)" 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
+
+[0] → #2  CTRL</title></g><g class="node" id="n2" data-id="2" transform="translate(632,24)" 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(631,1282)" 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
+Type not computed
+
+[0] → #35  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(752,68)" 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">  #4/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 arg
+Projection 1 of #2
+Type not computed
+
+[0] → #2  DATA</title></g><g class="node" id="n5" data-id="5" transform="translate(612,537)" 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">  #5/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 True
+Projection 0 of #14
+Type not computed
+
+[0] → #14  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(328,68)" 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">  #6</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 0
+Type not computed
+
+</title></g><g class="node" id="n7" data-id="7" transform="translate(480,68)" 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">  #7</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 0
+Type not computed
+
+</title></g><g class="node" id="n8" data-id="8" transform="translate(632,285)" 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">  #8</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 Loop
+Type not computed
+
+[0] → —  DATA
+[1] → #1  CTRL
+[2] → #15  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="n9" data-id="9" transform="translate(732,537)" 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">  #9/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 False
+Projection 1 of #14
+Type not computed
+
+[0] → #14  CTRL</title></g><g class="node" id="n10" data-id="10" transform="translate(148,996)" 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">  #10/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 True
+Projection 0 of #28
+Type not computed
+
+[0] → #28  CTRL</title></g><g class="node" id="n11" data-id="11" transform="translate(784,285)" 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_sum</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 φ_sum
+Type not computed
+
+[0] → #8  ASSOC
+[1] → #6  DATA
+[2] → #24  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] → #8</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="n12" data-id="12" transform="translate(936,285)" 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_i</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 φ_i
+Type not computed
+
+[0] → #8  ASSOC
+[1] → #7  DATA
+[2] → #19  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] → #8</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="n13" data-id="13" transform="translate(936,389)" 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">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 &lt;
+Type not computed
+
+[0] → —  DATA
+[1] → #12  DATA
+[2] → #4  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="n14" data-id="14" transform="translate(612,493)" 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">  #14</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#14 If
+Type not computed
+
+[0] → #8  CTRL
+[1] → #13  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="n15" data-id="15" transform="translate(268,996)" 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">  #15/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#15 False
+Projection 1 of #28
+Type not computed
+
+[0] → #28  CTRL</title></g><g class="node" id="n18" data-id="18" transform="translate(24,68)" 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>1</tspan><tspan class="node-id">  #18</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#18 1
+Type not computed
+
+</title></g><g class="node" id="n19" data-id="19" transform="translate(784,389)" 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">  #19</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#19 +
+Type not computed
+
+[0] → —  DATA
+[1] → #12  DATA
+[2] → #18  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="n20" data-id="20" transform="translate(1038,68)" 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">  #20</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#20 0
+Type not computed
+
+</title></g><g class="node" id="n21" data-id="21" transform="translate(168,744)" 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">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 Loop
+Type not computed
+
+[0] → —  DATA
+[1] → #5  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="n24" data-id="24" transform="translate(320,744)" 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_sum</tspan><tspan class="node-id">  #24</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#24 φ_sum
+Type not computed
+
+[0] → #21  ASSOC
+[1] → #11  DATA
+[2] → #32  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] → #21</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="n26" data-id="26" transform="translate(472,744)" 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_j</tspan><tspan class="node-id">  #26</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#26 φ_j
+Type not computed
+
+[0] → #21  ASSOC
+[1] → #20  DATA
+[2] → #34  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] → #21</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="n27" data-id="27" transform="translate(415,848)" 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">  #27</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#27 &lt;
+Type not computed
+
+[0] → —  DATA
+[1] → #26  DATA
+[2] → #4  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="n28" data-id="28" transform="translate(148,952)" 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">  #28</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#28 If
+Type not computed
+
+[0] → #21  CTRL
+[1] → #27  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="n32" data-id="32" transform="translate(274,848)" 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">  #32</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#32 +
+Type not computed
+
+[0] → —  DATA
+[1] → #26  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="n33" data-id="33" transform="translate(1190,68)" 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>1</tspan><tspan class="node-id">  #33</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#33 1
+Type not computed
+
+</title></g><g class="node" id="n34" data-id="34" transform="translate(567,848)" 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">  #34</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#34 +
+Type not computed
+
+[0] → —  DATA
+[1] → #26  DATA
+[2] → #33  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="n35" data-id="35" transform="translate(752,1184)" 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">  #35</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#35 Return
+Type not computed
+
+[0] → #9  CTRL
+[1] → #11  DATA</title><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="40" y="-10" text-anchor="middle">0</text><text class="slot" x="80" y="-10" text-anchor="middle">1</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(72,171)"><text class="label" x="26" y="17"><tspan>Loop</tspan><tspan class="node-id">  #8</tspan></text><title>Loop · 17 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #8"><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(116,640)"><text class="label" x="26" y="17"><tspan>Loop</tspan><tspan class="node-id">  #21</tspan></text><title>Loop · 9 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #21"><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>
diff --git a/chapter07/docs/07-graph4.json b/chapter07/docs/07-graph4.json
new file mode 100644
index 00000000..a9848505
--- /dev/null
+++ b/chapter07/docs/07-graph4.json
@@ -0,0 +1,37 @@
+{
+  "ver": 1,
+  "comp": "chapter07/docs/07-graph4.svg",
+  "step": 1,
+  "roots": [],
+  "scope": 0,
+  "nodes": [
+    {"id": 1, "label": "$ctrl", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 2, "role": "CTRL", "label": null}], "proj": {"par": 2, "idx": 0}},
+    {"id": 2, "label": "Start", "type": null, "kind": "CTRL", "edges": [], "proj": null},
+    {"id": 3, "label": "Stop", "type": null, "kind": "STOP", "edges": [{"idx": 0, "def": 30, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 4, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 15, "role": "CTRL", "label": null}], "proj": {"par": 15, "idx": 0}},
+    {"id": 5, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 15, "role": "CTRL", "label": null}], "proj": {"par": 15, "idx": 1}},
+    {"id": 6, "label": "1", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 7, "label": "2", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 8, "label": "Loop", "type": null, "kind": "LOOP", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 1, "role": "CTRL", "label": null}, {"idx": 2, "def": 27, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 9, "label": "True", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 21, "role": "CTRL", "label": null}], "proj": {"par": 21, "idx": 0}},
+    {"id": 10, "label": "False", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 21, "role": "CTRL", "label": null}], "proj": {"par": 21, "idx": 1}},
+    {"id": 11, "label": "φ_a", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 8, "role": "ASSOC", "label": null}, {"idx": 1, "def": 6, "role": "DATA", "label": null}, {"idx": 2, "def": 28, "role": "DATA", "label": null}], "proj": null},
+    {"id": 12, "label": "φ_b", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 8, "role": "ASSOC", "label": null}, {"idx": 1, "def": 7, "role": "DATA", "label": null}, {"idx": 2, "def": 29, "role": "DATA", "label": null}], "proj": null},
+    {"id": 13, "label": "10", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 14, "label": "<", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 11, "role": "DATA", "label": null}, {"idx": 2, "def": 13, "role": "DATA", "label": null}], "proj": null},
+    {"id": 15, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 8, "role": "CTRL", "label": null}, {"idx": 1, "def": 14, "role": "DATA", "label": null}], "proj": null},
+    {"id": 19, "label": "2", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 20, "label": "==", "type": null, "kind": "DATA", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 11, "role": "DATA", "label": null}, {"idx": 2, "def": 19, "role": "DATA", "label": null}], "proj": null},
+    {"id": 21, "label": "If", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 4, "role": "CTRL", "label": null}, {"idx": 1, "def": 20, "role": "DATA", "label": null}], "proj": null},
+    {"id": 25, "label": "3", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 26, "label": "4", "type": null, "kind": "DATA", "edges": [], "proj": null},
+    {"id": 27, "label": "Region", "type": null, "kind": "REGION", "edges": [{"idx": 0, "def": 0, "role": "DATA", "label": null}, {"idx": 1, "def": 9, "role": "CTRL", "label": null}, {"idx": 2, "def": 10, "role": "CTRL", "label": null}], "proj": null},
+    {"id": 28, "label": "φ_a", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 27, "role": "ASSOC", "label": null}, {"idx": 1, "def": 25, "role": "DATA", "label": null}, {"idx": 2, "def": 11, "role": "DATA", "label": null}], "proj": null},
+    {"id": 29, "label": "φ_b", "type": null, "kind": "PHI", "edges": [{"idx": 0, "def": 27, "role": "ASSOC", "label": null}, {"idx": 1, "def": 12, "role": "DATA", "label": null}, {"idx": 2, "def": 26, "role": "DATA", "label": null}], "proj": null},
+    {"id": 30, "label": "Return", "type": null, "kind": "CTRL", "edges": [{"idx": 0, "def": 5, "role": "CTRL", "label": null}, {"idx": 1, "def": 12, "role": "DATA", "label": null}], "proj": null}
+  ],
+  "groups": [
+    {"id": 8, "par": 0, "nodes": [4, 5, 8, 11, 12, 14, 15]},
+    {"id": 21, "par": 8, "nodes": [9, 10, 20, 21, 27, 28, 29]}
+  ]
+}
diff --git a/chapter07/docs/07-graph4.svg b/chapter07/docs/07-graph4.svg
index cf42453d..0fc498f7 100644
--- a/chapter07/docs/07-graph4.svg
+++ b/chapter07/docs/07-graph4.svg
@@ -1,329 +1,159 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: chapter07 Pages: 1 -->
-<svg width="394pt" height="545pt"
- viewBox="0.00 0.00 394.00 545.35" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 541.35)">
-<title>chapter07</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-541.35 390,-541.35 390,4 -4,4"/>
-<g id="clust1" class="cluster">
-<title>cluster_Nodes</title>
-<polygon fill="none" stroke="black" points="8,-33.35 8,-529.35 378,-529.35 378,-33.35 8,-33.35"/>
-</g>
-<!-- Start2 -->
-<g id="node1" class="node">
-<title>Start2</title>
-<polygon fill="yellow" stroke="transparent" points="312,-492.35 312,-517.35 362,-517.35 362,-492.35 312,-492.35"/>
-<polygon fill="none" stroke="black" points="312,-492.35 312,-517.35 362,-517.35 362,-492.35 312,-492.35"/>
-<text text-anchor="start" x="318.5" y="-501.15" font-family="Times,serif" font-size="14.00">Start</text>
-<polygon fill="none" stroke="black" points="312,-461.35 312,-492.35 362,-492.35 362,-461.35 312,-461.35"/>
-<polygon fill="yellow" stroke="transparent" points="317,-466.35 317,-487.35 357,-487.35 357,-466.35 317,-466.35"/>
-<polygon fill="none" stroke="black" points="317,-466.35 317,-487.35 357,-487.35 357,-466.35 317,-466.35"/>
-<text text-anchor="start" x="320" y="-473.15" font-family="Times,serif" font-size="14.00">$ctrl</text>
-</g>
-<!-- Stop3 -->
-<g id="node2" class="node">
-<title>Stop3</title>
-<polygon fill="yellow" stroke="black" points="370,-77.35 316,-77.35 316,-41.35 370,-41.35 370,-77.35"/>
-<text text-anchor="middle" x="343" y="-55.65" font-family="Times,serif" font-size="14.00">Stop</text>
-</g>
-<!-- Return30 -->
-<g id="node19" class="node">
-<title>Return30</title>
-<polygon fill="yellow" stroke="black" points="370,-163.35 304,-163.35 304,-127.35 370,-127.35 370,-163.35"/>
-<text text-anchor="middle" x="337" y="-141.65" font-family="Times,serif" font-size="14.00">Return</text>
-</g>
-<!-- Stop3&#45;&gt;Return30 -->
-<g id="edge1" class="edge">
-<title>Stop3&#45;&gt;Return30</title>
-<path fill="none" stroke="red" d="M341.76,-77.75C340.95,-89.09 339.87,-104.12 338.95,-117.03"/>
-<polygon fill="red" stroke="red" points="335.44,-117.03 338.22,-127.25 342.42,-117.53 335.44,-117.03"/>
-<text text-anchor="middle" x="338.76" y="-80.35" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Con_6 -->
-<g id="node3" class="node">
-<title>Con_6</title>
-<ellipse fill="none" stroke="black" cx="196" cy="-489.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="196" y="-485.65" font-family="Times,serif" font-size="14.00">1</text>
-</g>
-<!-- Con_7 -->
-<g id="node4" class="node">
-<title>Con_7</title>
-<ellipse fill="none" stroke="black" cx="124" cy="-489.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="124" y="-485.65" font-family="Times,serif" font-size="14.00">2</text>
-</g>
-<!-- Loop8 -->
-<g id="node5" class="node">
-<title>Loop8</title>
-<polygon fill="yellow" stroke="black" points="367,-421.35 313,-421.35 313,-385.35 367,-385.35 367,-421.35"/>
-<text text-anchor="middle" x="340" y="-399.65" font-family="Times,serif" font-size="14.00">Loop</text>
-</g>
-<!-- Loop8&#45;&gt;Start2 -->
-<g id="edge2" class="edge">
-<title>Loop8&#45;&gt;Start2:p0</title>
-<path fill="none" stroke="red" d="M338.71,-421.43C338.08,-430.88 337.4,-443.1 337.13,-455.02"/>
-<polygon fill="red" stroke="red" points="333.62,-455.3 337,-465.35 340.62,-455.39 333.62,-455.3"/>
-<text text-anchor="middle" x="335.71" y="-424.03" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Region27 -->
-<g id="node16" class="node">
-<title>Region27</title>
-<polygon fill="yellow" stroke="black" points="298,-77.35 232,-77.35 232,-41.35 298,-41.35 298,-77.35"/>
-<text text-anchor="middle" x="265" y="-55.65" font-family="Times,serif" font-size="14.00">Region</text>
-</g>
-<!-- Loop8&#45;&gt;Region27 -->
-<g id="edge3" class="edge">
-<title>Loop8&#45;&gt;Region27</title>
-<path fill="none" stroke="red" d="M312.6,-389.27C286.36,-376.62 248.79,-358.1 235,-349.35 191.17,-321.51 165.74,-324.02 143,-277.35 130.54,-251.78 139.66,-241.59 143,-213.35 145.69,-190.65 153.07,-131.47 167,-113.35 174.64,-103.41 199.67,-89.94 222.53,-79.07"/>
-<polygon fill="red" stroke="red" points="224.22,-82.15 231.8,-74.74 221.25,-75.8 224.22,-82.15"/>
-<text text-anchor="middle" x="309.6" y="-382.87" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_a11 -->
-<g id="node6" class="node">
-<title>Phi_a11</title>
-<ellipse fill="lightyellow" stroke="black" cx="196" cy="-403.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="196" y="-399.65" font-family="Times,serif" font-size="14.00">φ_a</text>
-</g>
-<!-- Phi_a11&#45;&gt;Con_6 -->
-<g id="edge5" class="edge">
-<title>Phi_a11&#45;&gt;Con_6</title>
-<path fill="none" stroke="black" d="M196,-421.75C196,-433.09 196,-448.12 196,-461.03"/>
-<polygon fill="black" stroke="black" points="192.5,-461.25 196,-471.25 199.5,-461.25 192.5,-461.25"/>
-<text text-anchor="middle" x="193" y="-424.35" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_a11&#45;&gt;Loop8 -->
-<g id="edge4" class="edge">
-<title>Phi_a11&#45;&gt;Loop8</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M210.22,-387.78C218.37,-380.03 229.29,-371.45 241,-367.35 263.65,-359.4 272.35,-359.4 295,-367.35 302.14,-369.85 308.99,-374.02 315.09,-378.65"/>
-<polygon fill="black" stroke="black" points="312.99,-381.44 322.92,-385.13 317.45,-376.05 312.99,-381.44"/>
-<text text-anchor="middle" x="207.22" y="-381.38" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Phi_a28 -->
-<g id="node17" class="node">
-<title>Phi_a28</title>
-<ellipse fill="lightyellow" stroke="black" cx="187" cy="-59.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="187" y="-55.65" font-family="Times,serif" font-size="14.00">φ_a</text>
-</g>
-<!-- Phi_b12 -->
-<g id="node7" class="node">
-<title>Phi_b12</title>
-<ellipse fill="lightyellow" stroke="black" cx="124" cy="-403.35" rx="27.1" ry="18"/>
-<text text-anchor="middle" x="124" y="-399.65" font-family="Times,serif" font-size="14.00">φ_b</text>
-</g>
-<!-- Phi_b12&#45;&gt;Con_7 -->
-<g id="edge8" class="edge">
-<title>Phi_b12&#45;&gt;Con_7</title>
-<path fill="none" stroke="black" d="M124,-421.75C124,-433.09 124,-448.12 124,-461.03"/>
-<polygon fill="black" stroke="black" points="120.5,-461.25 124,-471.25 127.5,-461.25 120.5,-461.25"/>
-<text text-anchor="middle" x="121" y="-424.35" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_b12&#45;&gt;Loop8 -->
-<g id="edge7" class="edge">
-<title>Phi_b12&#45;&gt;Loop8</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M138.22,-387.78C146.37,-380.03 157.29,-371.45 169,-367.35 221.84,-348.81 242.16,-348.81 295,-367.35 302.14,-369.85 308.99,-374.02 315.09,-378.65"/>
-<polygon fill="black" stroke="black" points="312.99,-381.44 322.92,-385.13 317.45,-376.05 312.99,-381.44"/>
-<text text-anchor="middle" x="135.22" y="-381.38" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Phi_b29 -->
-<g id="node18" class="node">
-<title>Phi_b29</title>
-<ellipse fill="lightyellow" stroke="black" cx="43" cy="-59.35" rx="27.1" ry="18"/>
-<text text-anchor="middle" x="43" y="-55.65" font-family="Times,serif" font-size="14.00">φ_b</text>
-</g>
-<!-- Con_13 -->
-<g id="node8" class="node">
-<title>Con_13</title>
-<ellipse fill="none" stroke="black" cx="268" cy="-403.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="268" y="-399.65" font-family="Times,serif" font-size="14.00">10</text>
-</g>
-<!-- LT14 -->
-<g id="node9" class="node">
-<title>LT14</title>
-<ellipse fill="none" stroke="black" cx="271" cy="-331.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="271" y="-327.65" font-family="Times,serif" font-size="14.00">&lt;</text>
-</g>
-<!-- LT14&#45;&gt;Phi_a11 -->
-<g id="edge10" class="edge">
-<title>LT14&#45;&gt;Phi_a11</title>
-<path fill="none" stroke="black" d="M255.82,-346.51C245.15,-356.47 230.68,-369.98 218.65,-381.21"/>
-<polygon fill="black" stroke="black" points="216.08,-378.82 211.15,-388.2 220.85,-383.94 216.08,-378.82"/>
-<text text-anchor="middle" x="252.82" y="-349.11" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- LT14&#45;&gt;Con_13 -->
-<g id="edge11" class="edge">
-<title>LT14&#45;&gt;Con_13</title>
-<path fill="none" stroke="black" d="M270.26,-349.65C269.93,-357.36 269.53,-366.63 269.16,-375.23"/>
-<polygon fill="black" stroke="black" points="265.66,-375.1 268.73,-385.24 272.66,-375.4 265.66,-375.1"/>
-<text text-anchor="middle" x="267.26" y="-352.25" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- If15 -->
-<g id="node10" class="node">
-<title>If15</title>
-<polygon fill="yellow" stroke="transparent" points="260,-248.35 260,-273.35 354,-273.35 354,-248.35 260,-248.35"/>
-<polygon fill="none" stroke="black" points="260,-248.35 260,-273.35 354,-273.35 354,-248.35 260,-248.35"/>
-<text text-anchor="start" x="301.5" y="-257.15" font-family="Times,serif" font-size="14.00">If</text>
-<polygon fill="none" stroke="black" points="260,-217.35 260,-248.35 354,-248.35 354,-217.35 260,-217.35"/>
-<polygon fill="yellow" stroke="transparent" points="265,-222.35 265,-243.35 305,-243.35 305,-222.35 265,-222.35"/>
-<polygon fill="none" stroke="black" points="265,-222.35 265,-243.35 305,-243.35 305,-222.35 265,-222.35"/>
-<text text-anchor="start" x="268" y="-229.15" font-family="Times,serif" font-size="14.00">True</text>
-<polygon fill="yellow" stroke="transparent" points="305,-222.35 305,-243.35 349,-243.35 349,-222.35 305,-222.35"/>
-<polygon fill="none" stroke="black" points="305,-222.35 305,-243.35 349,-243.35 349,-222.35 305,-222.35"/>
-<text text-anchor="start" x="308" y="-229.15" font-family="Times,serif" font-size="14.00">False</text>
-</g>
-<!-- If15&#45;&gt;Loop8 -->
-<g id="edge12" class="edge">
-<title>If15&#45;&gt;Loop8</title>
-<path fill="none" stroke="red" d="M314.79,-277.64C317.5,-288.87 320.49,-301.65 323,-313.35 327.43,-333.98 331.89,-357.43 335.12,-375.08"/>
-<polygon fill="red" stroke="red" points="331.74,-376.02 336.97,-385.24 338.63,-374.77 331.74,-376.02"/>
-<text text-anchor="middle" x="311.79" y="-280.24" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- If15&#45;&gt;LT14 -->
-<g id="edge13" class="edge">
-<title>If15&#45;&gt;LT14</title>
-<path fill="none" stroke="black" d="M293.59,-277.62C289.8,-286.48 285.72,-296.01 282.08,-304.5"/>
-<polygon fill="black" stroke="black" points="278.78,-303.32 278.05,-313.89 285.21,-306.08 278.78,-303.32"/>
-<text text-anchor="middle" x="290.59" y="-280.22" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Con_19 -->
-<g id="node11" class="node">
-<title>Con_19</title>
-<ellipse fill="none" stroke="black" cx="130" cy="-331.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="130" y="-327.65" font-family="Times,serif" font-size="14.00">2</text>
-</g>
-<!-- EQ20 -->
-<g id="node12" class="node">
-<title>EQ20</title>
-<ellipse fill="none" stroke="black" cx="179" cy="-245.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="179" y="-241.65" font-family="Times,serif" font-size="14.00">==</text>
-</g>
-<!-- EQ20&#45;&gt;Phi_a11 -->
-<g id="edge14" class="edge">
-<title>EQ20&#45;&gt;Phi_a11</title>
-<path fill="none" stroke="black" d="M180.85,-263.34C183.79,-290.3 189.54,-343.11 193.05,-375.31"/>
-<polygon fill="black" stroke="black" points="189.59,-375.81 194.15,-385.38 196.55,-375.06 189.59,-375.81"/>
-<text text-anchor="middle" x="177.85" y="-265.94" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- EQ20&#45;&gt;Con_19 -->
-<g id="edge15" class="edge">
-<title>EQ20&#45;&gt;Con_19</title>
-<path fill="none" stroke="black" d="M169.55,-262.54C162.5,-274.63 152.74,-291.37 144.67,-305.19"/>
-<polygon fill="black" stroke="black" points="141.43,-303.8 139.42,-314.2 147.48,-307.33 141.43,-303.8"/>
-<text text-anchor="middle" x="166.55" y="-265.14" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- If21 -->
-<g id="node13" class="node">
-<title>If21</title>
-<polygon fill="yellow" stroke="transparent" points="184,-148.35 184,-173.35 278,-173.35 278,-148.35 184,-148.35"/>
-<polygon fill="none" stroke="black" points="184,-148.35 184,-173.35 278,-173.35 278,-148.35 184,-148.35"/>
-<text text-anchor="start" x="225.5" y="-157.15" font-family="Times,serif" font-size="14.00">If</text>
-<polygon fill="none" stroke="black" points="184,-117.35 184,-148.35 278,-148.35 278,-117.35 184,-117.35"/>
-<polygon fill="yellow" stroke="transparent" points="189,-122.35 189,-143.35 229,-143.35 229,-122.35 189,-122.35"/>
-<polygon fill="none" stroke="black" points="189,-122.35 189,-143.35 229,-143.35 229,-122.35 189,-122.35"/>
-<text text-anchor="start" x="192" y="-129.15" font-family="Times,serif" font-size="14.00">True</text>
-<polygon fill="yellow" stroke="transparent" points="229,-122.35 229,-143.35 273,-143.35 273,-122.35 229,-122.35"/>
-<polygon fill="none" stroke="black" points="229,-122.35 229,-143.35 273,-143.35 273,-122.35 229,-122.35"/>
-<text text-anchor="start" x="232" y="-129.15" font-family="Times,serif" font-size="14.00">False</text>
-</g>
-<!-- If21&#45;&gt;If15 -->
-<g id="edge16" class="edge">
-<title>If21&#45;&gt;If15:p0</title>
-<path fill="none" stroke="red" d="M266.11,-177.35C274.25,-187.13 281.31,-198.68 283.92,-211.16"/>
-<polygon fill="red" stroke="red" points="280.47,-211.77 285,-221.35 287.43,-211.03 280.47,-211.77"/>
-<text text-anchor="middle" x="263.11" y="-179.95" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- If21&#45;&gt;EQ20 -->
-<g id="edge17" class="edge">
-<title>If21&#45;&gt;EQ20</title>
-<path fill="none" stroke="black" d="M214.55,-177.35C207.43,-190.76 199.21,-206.25 192.47,-218.96"/>
-<polygon fill="black" stroke="black" points="189.24,-217.58 187.65,-228.05 195.42,-220.86 189.24,-217.58"/>
-<text text-anchor="middle" x="211.55" y="-179.95" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Con_25 -->
-<g id="node14" class="node">
-<title>Con_25</title>
-<ellipse fill="none" stroke="black" cx="111" cy="-145.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="111" y="-141.65" font-family="Times,serif" font-size="14.00">3</text>
-</g>
-<!-- Con_26 -->
-<g id="node15" class="node">
-<title>Con_26</title>
-<ellipse fill="none" stroke="black" cx="115" cy="-59.35" rx="27" ry="18"/>
-<text text-anchor="middle" x="115" y="-55.65" font-family="Times,serif" font-size="14.00">4</text>
-</g>
-<!-- Region27&#45;&gt;If21 -->
-<g id="edge18" class="edge">
-<title>Region27&#45;&gt;If21:p0</title>
-<path fill="none" stroke="red" d="M236.34,-77.55C225.26,-86.1 214.31,-97.52 210.45,-111.09"/>
-<polygon fill="red" stroke="red" points="206.94,-110.95 209,-121.35 213.87,-111.94 206.94,-110.95"/>
-<text text-anchor="middle" x="233.34" y="-80.15" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Region27&#45;&gt;If21 -->
-<g id="edge19" class="edge">
-<title>Region27&#45;&gt;If21:p1</title>
-<path fill="none" stroke="red" d="M258.9,-77.46C255.95,-86.91 252.79,-99.16 251.55,-111.27"/>
-<polygon fill="red" stroke="red" points="248.05,-111.17 251,-121.35 255.04,-111.55 248.05,-111.17"/>
-<text text-anchor="middle" x="255.9" y="-80.06" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_a28&#45;&gt;Phi_a11 -->
-<g id="edge22" class="edge">
-<title>Phi_a28&#45;&gt;Phi_a11</title>
-<path fill="none" stroke="black" d="M156.38,-74.81C123.24,-90.46 75.08,-113.23 75,-113.35 59.78,-137.38 66.63,-150.16 75,-177.35 90.81,-228.71 98.49,-247.23 143,-277.35 204.81,-319.16 260.23,-255.2 307,-313.35 317.03,-325.81 315.54,-335.81 307,-349.35 306.7,-349.82 259.29,-372.35 226.54,-387.88"/>
-<polygon fill="black" stroke="black" points="158.14,-77.85 165.69,-70.41 155.15,-71.52 158.14,-77.85"/>
-<polygon fill="black" stroke="black" points="224.86,-384.81 217.32,-392.25 227.86,-391.13 224.86,-384.81"/>
-<text text-anchor="middle" x="162.69" y="-73.01" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_a28&#45;&gt;Con_25 -->
-<g id="edge21" class="edge">
-<title>Phi_a28&#45;&gt;Con_25</title>
-<path fill="none" stroke="black" d="M173.41,-75.36C161.74,-88.26 144.74,-107.05 131.43,-121.77"/>
-<polygon fill="black" stroke="black" points="128.58,-119.7 124.47,-129.46 133.77,-124.39 128.58,-119.7"/>
-<text text-anchor="middle" x="170.41" y="-77.96" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_a28&#45;&gt;Region27 -->
-<g id="edge20" class="edge">
-<title>Phi_a28&#45;&gt;Region27</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M214.12,-59.35C216.58,-59.35 219.04,-59.35 221.5,-59.35"/>
-<polygon fill="black" stroke="black" points="221.61,-62.85 231.61,-59.35 221.61,-55.85 221.61,-62.85"/>
-<text text-anchor="middle" x="217.12" y="-52.95" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Phi_b29&#45;&gt;Phi_b12 -->
-<g id="edge24" class="edge">
-<title>Phi_b29&#45;&gt;Phi_b12</title>
-<path fill="none" stroke="black" d="M44.59,-87.64C48.34,-139.92 60.11,-257.16 94,-349.35 97.54,-358.97 102.7,-368.9 107.74,-377.53"/>
-<polygon fill="black" stroke="black" points="48.07,-87.25 43.91,-77.51 41.09,-87.72 48.07,-87.25"/>
-<polygon fill="black" stroke="black" points="104.9,-379.59 113.09,-386.31 110.88,-375.95 104.9,-379.59"/>
-<text text-anchor="middle" x="40.91" y="-80.11" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_b29&#45;&gt;Con_26 -->
-<g id="edge25" class="edge">
-<title>Phi_b29&#45;&gt;Con_26</title>
-<path fill="none" stroke="black" d="M70.56,-59.35C73,-59.35 75.44,-59.35 77.89,-59.35"/>
-<polygon fill="black" stroke="black" points="77.92,-62.85 87.92,-59.35 77.92,-55.85 77.92,-62.85"/>
-<text text-anchor="middle" x="73.56" y="-52.95" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_b29&#45;&gt;Region27 -->
-<g id="edge23" class="edge">
-<title>Phi_b29&#45;&gt;Region27</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M54.68,-42.66C62.75,-32.67 74.44,-20.87 88,-15.35 139.86,5.79 161.51,4.17 214,-15.35 224.63,-19.3 234.53,-26.57 242.72,-34.08"/>
-<polygon fill="black" stroke="black" points="240.44,-36.75 250.02,-41.26 245.34,-31.75 240.44,-36.75"/>
-<text text-anchor="middle" x="51.68" y="-36.26" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Return30&#45;&gt;Phi_b12 -->
-<g id="edge27" class="edge">
-<title>Return30&#45;&gt;Phi_b12</title>
-<path fill="none" stroke="black" d="M313.98,-163.53C307.84,-168.06 301.19,-172.92 295,-177.35 272.13,-193.69 260.87,-191.65 243,-213.35 223.27,-237.31 230.02,-250.17 215,-277.35 196.27,-311.22 188.92,-318.16 166,-349.35 158.65,-359.34 150.22,-370.11 142.84,-379.32"/>
-<polygon fill="black" stroke="black" points="139.98,-377.29 136.43,-387.27 145.43,-381.68 139.98,-377.29"/>
-<text text-anchor="middle" x="310.98" y="-166.13" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Return30&#45;&gt;If15 -->
-<g id="edge26" class="edge">
-<title>Return30&#45;&gt;If15:p1</title>
-<path fill="none" stroke="red" d="M333.39,-163.54C331,-176.2 328.14,-194.14 327.27,-211.34"/>
-<polygon fill="red" stroke="red" points="323.77,-211.26 327,-221.35 330.76,-211.44 323.77,-211.26"/>
-<text text-anchor="middle" x="330.39" y="-166.14" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-</g>
-</svg>
+<svg aria-label="Compiler graph" width="1151" height="1270" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1151 1270" 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; }
+    #program { width:min(600px,80vw); vertical-align:middle; }
+    #status { margin-top:4px; }
+    #graph { min-height:0; overflow:hidden; position:relative; background:#fafbfc; }
+    #elk { width:100%; height:100%; }
+    #graph svg { display:block; }
+    .tools { display:flex; flex-wrap:wrap; align-items:center; gap:14px; margin-top:8px; font-size:12px; }
+    .hint { color:#616c78; }
+    .ctrl { color:#b63838; } .mem { color:#2867b2; } .data { color:#536477; }
+    .edge { fill:none; stroke-width:1.5; }
+    .edge.CTRL { stroke-width:2; }
+    .edge.ASSOC { stroke-dasharray:4 4; }
+    .edge.PARSER { stroke-dasharray:5 4; }
+    .parser rect { fill:#f6f0ff; stroke:#7956a5; stroke-width:1.5; stroke-dasharray:5 4; }
+    .edge.selected { stroke-width:3.5; }
+    .edge.bundle { stroke-width:4; }
+    .edge.bundle.selected { stroke-width:6; }
+    .edge-hit { fill:none; stroke:transparent; stroke-width:12; vector-effect:non-scaling-stroke; pointer-events:stroke; cursor:pointer; }
+    .edge-jump { fill:transparent; pointer-events:all; cursor:pointer; }
+    .node { cursor:pointer; }
+    .box { stroke:#758191; stroke-width:1; }
+    .node.held .box { stroke-dasharray:5 3; }
+    .node.near .box { stroke:#c18221; stroke-width:2; }
+    .node.focus .box { stroke:#9c4900; stroke-width:3; }
+    .node.selected .box { stroke:#1569b9; stroke-width:3; }
+    .node.folded .box { stroke-width:4; }
+    .node.folding .box { fill:#f4ccd7; }
+    .fold-tag { font-size:9px; font-weight:700; fill:#963751; }
+    .peep-area { fill:#fff3d9; fill-opacity:.8; stroke:#c18221; stroke-width:2; pointer-events:none; }
+    .node.peep-edit .box { stroke:#9c4900; stroke-width:3; }
+    .node.error .box { stroke:#b42318; stroke-width:4; }
+    #event.error { color:#b42318; font-weight:600; white-space:pre-wrap; overflow-wrap:anywhere; }
+    .peep-ghosts { pointer-events:none; }
+    .region-box { stroke:#9da9b8; stroke-width:1.5; }
+    .fold-btn { cursor:pointer; }
+    .fold-btn rect { fill:white; stroke:#596674; }
+    .fold-btn text { font-size:14px; fill:#152330; }
+    .fold-btn:focus rect { stroke:#1569b9; stroke-width:2; }
+    .shortcut { cursor:pointer; }
+    .shortcut path { fill:none; stroke-width:1.5; }
+    .shortcut rect { fill:#fff8ec; stroke:#b63838; stroke-dasharray:3 2; }
+    .shortcut text { font-size:11px; fill:#783030; }
+    .shortcut.selected rect, .shortcut:focus rect { stroke-width:2.5; }
+    .label { font-size:12px; fill:#152330; font-weight:600; }
+    .node-id { font-size:10px; fill:#596674; font-weight:400; }
+    .type { font-size:11px; fill:#455768; }
+    .port { stroke:#536477; stroke-width:1; }
+    .row { stroke:#b6afcf; stroke-width:1; }
+    .bind { font-size:12px; fill:#152330; }
+    .slot { font-size:10px; fill:#364352; paint-order:stroke; stroke:#fafbfc; stroke-width:3; }
+    #detail { position:absolute; top:8px; right:8px; margin:0; padding:12px; max-width:320px;
+      max-height:45%; overflow:auto; white-space:pre-wrap; overflow-wrap:anywhere;
+      background:#fffffff2; border:1px solid #bac5d0; border-radius:4px; font-size:12px; }
+    .controls { display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:6px; padding:6px; }
+    .button { color:white; background:black; font-size:20px; min-width:30px; }
+    .button:disabled { background:grey; }
+    .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(24,173)"><rect class="region-box" rx="8" width="813" height="890" fill="#f1f6fc"/></g><g class="region" transform="translate(271,632)"><rect class="region-box" rx="8" width="512" height="374" fill="#f2f7ef"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e3i0" d="M269,1169 C269,1193 575.5,1196 575.5,1220" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #30 · CTRL</title></path><path class="edge CTRL" id="e8i1" d="M149,118 L149,271" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[1] → #1 · CTRL</title></path><path class="edge CTRL" id="e8i2" d="M407,971 L407,981 L825,981 L825,246 L179,246 L179,274" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[2] → #27 · CTRL</title></path><path class="edge DATA" id="e11i1" d="M307,118 L307,128 L281,128 L281,271" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#11[1] → #6 · DATA</title></path><path class="edge DATA" id="e11i2" d="M559,971 L559,981 L815,981 L815,254 L321,254 L321,274" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#11[2] → #28 · DATA</title></path><path class="edge DATA" id="e12i1" d="M459,118 L459,128 L433,128 L433,271" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[1] → #7 · DATA</title></path><path class="edge DATA" id="e12i2" d="M711,971 L711,981 L805,981 L805,262 L473,262 L473,274" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#12[2] → #29 · DATA</title></path><path class="edge DATA" id="e14i1" d="M301,327 L301,357 L255,357 L255,375" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[1] → #11 · DATA</title></path><path class="edge DATA" id="e14i2" d="M611,118 L611,128 L523,128 L523,337 L285,337 L285,375" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#14[2] → #13 · DATA</title></path><path class="edge CTRL" id="e15i0" d="M149,327 L149,479" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#15[0] → #8 · CTRL</title></path><path class="edge DATA" id="e15i1" d="M255,431 L255,441 L229,441 L229,479" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#15[1] → #14 · DATA</title></path><path class="edge DATA" id="e20i1" d="M301,327 L301,357 L443,357 L443,666" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#20[1] → #11 · DATA</title></path><path class="edge DATA" id="e20i2" d="M763,118 L763,138 L534,138 L534,589 L473,589 L473,666" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#20[2] → #19 · DATA</title></path><path class="edge CTRL" id="e21i0" d="M129,579 L129,599 L363,599 L363,770" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[0] → #4 · CTRL</title></path><path class="edge DATA" id="e21i1" d="M443,722 L443,770" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#21[1] → #20 · DATA</title></path><path class="edge CTRL" id="e27i1" d="M343,870 L343,880 L407,880 L407,918" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#27[1] → #9 · CTRL</title></path><path class="edge CTRL" id="e27i2" d="M463,870 L463,880 L437,880 L437,918" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#27[2] → #10 · CTRL</title></path><path class="edge DATA" id="e28i1" d="M915,118 L915,148 L545,148 L545,589 L539,589 L539,918" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#28[1] → #25 · DATA</title></path><path class="edge DATA" id="e28i2" d="M301,327 L301,357 L579,357 L579,918" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#28[2] → #11 · DATA</title></path><path class="edge DATA" id="e29i1" d="M453,327 L453,347 L590,347 L590,589 L691,589 L691,918" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#29[1] → #12 · DATA</title></path><path class="edge DATA" id="e29i2" d="M1067,118 L1067,158 L731,158 L731,918" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#29[2] → #26 · DATA</title></path><path class="edge CTRL" id="e30i0" d="M249,579 L249,1116" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#30[0] → #5 · CTRL</title></path><path class="edge DATA" id="e30i1" d="M453,327 L453,347 L325,347 L325,589 L260,589 L260,1078 L289,1078 L289,1116" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#30[1] → #12 · 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(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">  #1/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 $ctrl
+Projection 0 of #2
+Type not computed
+
+[0] → #2  CTRL</title></g><g class="node" id="n2" data-id="2" transform="translate(89,24)" 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(539.5,1220)" 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
+Type not computed
+
+[0] → #30  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(69,529)" 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">  #4/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 True
+Projection 0 of #15
+Type not computed
+
+[0] → #15  CTRL</title></g><g class="node" id="n5" data-id="5" transform="translate(189,529)" 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">  #5/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 False
+Projection 1 of #15
+Type not computed
+
+[0] → #15  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(247,68)" 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>1</tspan><tspan class="node-id">  #6</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 1
+Type not computed
+
+</title></g><g class="node" id="n7" data-id="7" transform="translate(399,68)" 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">  #7</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 2
+Type not computed
+
+</title></g><g class="node" id="n8" data-id="8" transform="translate(89,277)" 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">  #8</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 Loop
+Type not computed
+
+[0] → —  DATA
+[1] → #1  CTRL
+[2] → #27  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="n9" data-id="9" transform="translate(283,820)" 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">  #9/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 True
+Projection 0 of #21
+Type not computed
+
+[0] → #21  CTRL</title></g><g class="node" id="n10" data-id="10" transform="translate(403,820)" 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 #21
+Type not computed
+
+[0] → #21  CTRL</title></g><g class="node" id="n11" data-id="11" transform="translate(241,277)" 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_a</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 φ_a
+Type not computed
+
+[0] → #8  ASSOC
+[1] → #6  DATA
+[2] → #28  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] → #8</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="n12" data-id="12" transform="translate(393,277)" 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_b</tspan><tspan class="node-id">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 φ_b
+Type not computed
+
+[0] → #8  ASSOC
+[1] → #7  DATA
+[2] → #29  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] → #8</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="n13" data-id="13" transform="translate(551,68)" 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>10</tspan><tspan class="node-id">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#13 10
+Type not computed
+
+</title></g><g class="node" id="n14" data-id="14" transform="translate(195,381)" 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] → #11  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(69,485)" 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">  #15</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#15 If
+Type not computed
+
+[0] → #8  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="n19" data-id="19" transform="translate(703,68)" 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">  #19</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#19 2
+Type not computed
+
+</title></g><g class="node" id="n20" data-id="20" transform="translate(383,672)" 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">  #20</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#20 ==
+Type not computed
+
+[0] → —  DATA
+[1] → #11  DATA
+[2] → #19  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(283,776)" 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">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#21 If
+Type not computed
+
+[0] → #4  CTRL
+[1] → #20  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="n25" data-id="25" transform="translate(855,68)" 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">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#25 3
+Type not computed
+
+</title></g><g class="node" id="n26" data-id="26" transform="translate(1007,68)" 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>4</tspan><tspan class="node-id">  #26</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#26 4
+Type not computed
+
+</title></g><g class="node" id="n27" data-id="27" transform="translate(347,924)" 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">  #27</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#27 Region
+Type not computed
+
+[0] → —  DATA
+[1] → #9  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="n28" data-id="28" transform="translate(499,924)" 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_a</tspan><tspan class="node-id">  #28</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#28 φ_a
+Type not computed
+
+[0] → #27  ASSOC
+[1] → #25  DATA
+[2] → #11  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] → #27</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="n29" data-id="29" transform="translate(651,924)" 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_b</tspan><tspan class="node-id">  #29</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#29 φ_b
+Type not computed
+
+[0] → #27  ASSOC
+[1] → #12  DATA
+[2] → #26  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] → #27</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="n30" data-id="30" transform="translate(209,1122)" 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">  #30</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#30 Return
+Type not computed
+
+[0] → #5  CTRL
+[1] → #12  DATA</title><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="40" y="-10" text-anchor="middle">0</text><text class="slot" x="80" y="-10" text-anchor="middle">1</text></g></g><g class="region-heads" style="opacity: 1;"><g class="region-head" transform="translate(24,173)"><text class="label" x="26" y="17"><tspan>Loop</tspan><tspan class="node-id">  #8</tspan></text><title>Loop · 14 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #8"><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(271,632)"><text class="label" x="26" y="17"><tspan>If</tspan><tspan class="node-id">  #21</tspan></text><title>If · 7 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #21"><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>
diff --git a/chapter07/docs/Makefile b/chapter07/docs/Makefile
index 12659b8f..6fa0f057 100644
--- a/chapter07/docs/Makefile
+++ b/chapter07/docs/Makefile
@@ -1,12 +1 @@
-GV := $(wildcard *.gv)
-SVG := $(patsubst %.gv,%.svg,$(GV))
-
-.PHONY: all
-all: $(SVG)
-
-%.svg: %.gv
-	dot -Tsvg $< > $@
-
-.PHONY: clean
-clean:
-	@rm -f $(SVG)
+include ../../graph/docs.mk
author	Cliff Click <cliffc@acm.org>	2026-10-02 13:04:34 -0700
committer	Cliff Click <cliffc@acm.org>	2026-10-02 13:04:34 -0700
commit	e4dc3273f201ae741637b626998637cce973546b (patch)
tree	7607c1da4378da42549e8142371d95bdca4e06e0 /chapter07/docs
parent	6cd01a8d646750748a0af221073de8a7787472ad (diff)
download	Simple-e4dc3273f201ae741637b626998637cce973546b.tar.gz Simple-e4dc3273f201ae741637b626998637cce973546b.zip