From e4dc3273f201ae741637b626998637cce973546b Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Fri, 2 Oct 2026 13:04:34 -0700
Subject: First pass README updates

---
 chapter06/docs/06-graph3-nonconst.svg | 440 ++++++++++++----------------------
 1 file changed, 150 insertions(+), 290 deletions(-)

(limited to 'chapter06/docs/06-graph3-nonconst.svg')

diff --git a/chapter06/docs/06-graph3-nonconst.svg b/chapter06/docs/06-graph3-nonconst.svg
index dee852e4..d46d4bb1 100644
--- a/chapter06/docs/06-graph3-nonconst.svg
+++ b/chapter06/docs/06-graph3-nonconst.svg
@@ -1,290 +1,150 @@
-<?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: chapter06 Pages: 1 -->
-<svg width="414pt" height="664pt"
- viewBox="0.00 0.00 414.00 664.00" 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(4 660)">
-<title>chapter06</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-660 410,-660 410,4 -4,4"/>
-<g id="clust1" class="cluster">
-<title>cluster_Nodes</title>
-<polygon fill="none" stroke="black" points="8,-8 8,-648 398,-648 398,-8 8,-8"/>
-</g>
-<!-- Start2 -->
-<g id="node1" class="node">
-<title>Start2</title>
-<polygon fill="yellow" stroke="transparent" points="274,-611 274,-636 355,-636 355,-611 274,-611"/>
-<polygon fill="none" stroke="black" points="274,-611 274,-636 355,-636 355,-611 274,-611"/>
-<text text-anchor="start" x="296" y="-619.8" font-family="Times,serif" font-size="14.00">Start</text>
-<polygon fill="none" stroke="black" points="274,-580 274,-611 355,-611 355,-580 274,-580"/>
-<polygon fill="yellow" stroke="transparent" points="279,-585 279,-606 319,-606 319,-585 279,-585"/>
-<polygon fill="none" stroke="black" points="279,-585 279,-606 319,-606 319,-585 279,-585"/>
-<text text-anchor="start" x="282" y="-591.8" font-family="Times,serif" font-size="14.00">$ctrl</text>
-<polygon fill="none" stroke="black" points="319,-585 319,-606 350,-606 350,-585 319,-585"/>
-<text text-anchor="start" x="322" y="-591.8" 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="299,-52 245,-52 245,-16 299,-16 299,-52"/>
-<text text-anchor="middle" x="272" y="-30.3" font-family="Times,serif" font-size="14.00">Stop</text>
-</g>
-<!-- Return25 -->
-<g id="node16" class="node">
-<title>Return25</title>
-<polygon fill="yellow" stroke="black" points="305,-124 239,-124 239,-88 305,-88 305,-124"/>
-<text text-anchor="middle" x="272" y="-102.3" font-family="Times,serif" font-size="14.00">Return</text>
-</g>
-<!-- Stop3&#45;&gt;Return25 -->
-<g id="edge1" class="edge">
-<title>Stop3&#45;&gt;Return25</title>
-<path fill="none" stroke="red" d="M272,-52.3C272,-60.02 272,-69.29 272,-77.89"/>
-<polygon fill="red" stroke="red" points="268.5,-77.9 272,-87.9 275.5,-77.9 268.5,-77.9"/>
-<text text-anchor="middle" x="269" y="-54.9" 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="259" cy="-322" rx="27" ry="18"/>
-<text text-anchor="middle" x="259" y="-318.3" 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="115" cy="-322" rx="27" ry="18"/>
-<text text-anchor="middle" x="115" y="-318.3" font-family="Times,serif" font-size="14.00">#1</text>
-</g>
-<!-- If8 -->
-<g id="node5" class="node">
-<title>If8</title>
-<polygon fill="yellow" stroke="transparent" points="288,-511 288,-536 382,-536 382,-511 288,-511"/>
-<polygon fill="none" stroke="black" points="288,-511 288,-536 382,-536 382,-511 288,-511"/>
-<text text-anchor="start" x="329.5" y="-519.8" font-family="Times,serif" font-size="14.00">If</text>
-<polygon fill="none" stroke="black" points="288,-480 288,-511 382,-511 382,-480 288,-480"/>
-<polygon fill="yellow" stroke="transparent" points="293,-485 293,-506 333,-506 333,-485 293,-485"/>
-<polygon fill="none" stroke="black" points="293,-485 293,-506 333,-506 333,-485 293,-485"/>
-<text text-anchor="start" x="296" y="-491.8" font-family="Times,serif" font-size="14.00">True</text>
-<polygon fill="yellow" stroke="transparent" points="333,-485 333,-506 377,-506 377,-485 333,-485"/>
-<polygon fill="none" stroke="black" points="333,-485 333,-506 377,-506 377,-485 333,-485"/>
-<text text-anchor="start" x="336" y="-491.8" font-family="Times,serif" font-size="14.00">False</text>
-</g>
-<!-- If8&#45;&gt;Start2 -->
-<g id="edge2" class="edge">
-<title>If8&#45;&gt;Start2:p0</title>
-<path fill="none" stroke="red" d="M312.41,-540.3C306.75,-550.38 301.75,-562.04 299.83,-573.96"/>
-<polygon fill="red" stroke="red" points="296.34,-573.75 299,-584 303.31,-574.32 296.34,-573.75"/>
-<text text-anchor="middle" x="309.41" y="-542.9" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- If8&#45;&gt;Start2 -->
-<g id="edge3" class="edge">
-<title>If8&#45;&gt;Start2:p1</title>
-<path fill="none" stroke="black" d="M335,-540.02C335,-550.47 335,-562.42 335,-573.98"/>
-<polygon fill="black" stroke="black" points="331.5,-574 335,-584 338.5,-574 331.5,-574"/>
-<text text-anchor="middle" x="332" y="-542.62" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Con_12 -->
-<g id="node6" class="node">
-<title>Con_12</title>
-<ellipse fill="none" stroke="black" cx="187" cy="-322" rx="27" ry="18"/>
-<text text-anchor="middle" x="187" y="-318.3" font-family="Times,serif" font-size="14.00">#2</text>
-</g>
-<!-- If13 -->
-<g id="node7" class="node">
-<title>If13</title>
-<polygon fill="yellow" stroke="transparent" points="267,-411 267,-436 361,-436 361,-411 267,-411"/>
-<polygon fill="none" stroke="black" points="267,-411 267,-436 361,-436 361,-411 267,-411"/>
-<text text-anchor="start" x="308.5" y="-419.8" font-family="Times,serif" font-size="14.00">If</text>
-<polygon fill="none" stroke="black" points="267,-380 267,-411 361,-411 361,-380 267,-380"/>
-<polygon fill="yellow" stroke="transparent" points="272,-385 272,-406 312,-406 312,-385 272,-385"/>
-<polygon fill="none" stroke="black" points="272,-385 272,-406 312,-406 312,-385 272,-385"/>
-<text text-anchor="start" x="275" y="-391.8" font-family="Times,serif" font-size="14.00">True</text>
-<polygon fill="yellow" stroke="transparent" points="312,-385 312,-406 356,-406 356,-385 312,-385"/>
-<polygon fill="none" stroke="black" points="312,-385 312,-406 356,-406 356,-385 312,-385"/>
-<text text-anchor="start" x="315" y="-391.8" font-family="Times,serif" font-size="14.00">False</text>
-</g>
-<!-- If13&#45;&gt;Start2 -->
-<g id="edge5" class="edge">
-<title>If13&#45;&gt;Start2:p1</title>
-<path fill="none" stroke="black" d="M288.75,-440.22C281.57,-450.93 274.7,-463.4 271,-476 262.99,-503.29 257.76,-514.83 271,-540 285.19,-566.97 324.2,-553.71 333.15,-573.98"/>
-<polygon fill="black" stroke="black" points="329.75,-574.8 335,-584 336.63,-573.53 329.75,-574.8"/>
-<text text-anchor="middle" x="285.75" y="-442.82" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- If13&#45;&gt;If8 -->
-<g id="edge4" class="edge">
-<title>If13&#45;&gt;If8:p0</title>
-<path fill="none" stroke="red" d="M313.4,-440.02C313.24,-450.46 313.09,-462.42 313.03,-473.98"/>
-<polygon fill="red" stroke="red" points="309.53,-473.99 313,-484 316.53,-474.01 309.53,-473.99"/>
-<text text-anchor="middle" x="310.4" y="-442.62" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Con_17 -->
-<g id="node8" class="node">
-<title>Con_17</title>
-<ellipse fill="none" stroke="black" cx="43" cy="-408" rx="27" ry="18"/>
-<text text-anchor="middle" x="43" y="-404.3" font-family="Times,serif" font-size="14.00">#2</text>
-</g>
-<!-- Con_18 -->
-<g id="node9" class="node">
-<title>Con_18</title>
-<ellipse fill="none" stroke="black" cx="115" cy="-408" rx="27" ry="18"/>
-<text text-anchor="middle" x="115" y="-404.3" font-family="Times,serif" font-size="14.00">#3</text>
-</g>
-<!-- Region19 -->
-<g id="node10" class="node">
-<title>Region19</title>
-<polygon fill="yellow" stroke="black" points="370,-340 304,-340 304,-304 370,-304 370,-340"/>
-<text text-anchor="middle" x="337" y="-318.3" font-family="Times,serif" font-size="14.00">Region</text>
-</g>
-<!-- Region19&#45;&gt;If13 -->
-<g id="edge6" class="edge">
-<title>Region19&#45;&gt;If13:p0</title>
-<path fill="none" stroke="red" d="M315.29,-340.1C306.12,-348.94 296.78,-360.62 293.36,-373.72"/>
-<polygon fill="red" stroke="red" points="289.84,-373.63 292,-384 296.78,-374.54 289.84,-373.63"/>
-<text text-anchor="middle" x="312.29" y="-342.7" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Region19&#45;&gt;If13 -->
-<g id="edge7" class="edge">
-<title>Region19&#45;&gt;If13:p1</title>
-<path fill="none" stroke="red" d="M335.71,-340.08C335.08,-349.53 334.4,-361.76 334.13,-373.68"/>
-<polygon fill="red" stroke="red" points="330.62,-373.96 334,-384 337.62,-374.04 330.62,-373.96"/>
-<text text-anchor="middle" x="332.71" y="-342.68" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_b20 -->
-<g id="node11" class="node">
-<title>Phi_b20</title>
-<ellipse fill="lightyellow" stroke="black" cx="43" cy="-322" rx="27.1" ry="18"/>
-<text text-anchor="middle" x="43" y="-318.3" font-family="Times,serif" font-size="14.00">φ_b</text>
-</g>
-<!-- Phi_b20&#45;&gt;Con_17 -->
-<g id="edge9" class="edge">
-<title>Phi_b20&#45;&gt;Con_17</title>
-<path fill="none" stroke="black" d="M43,-340.4C43,-351.74 43,-366.77 43,-379.68"/>
-<polygon fill="black" stroke="black" points="39.5,-379.9 43,-389.9 46.5,-379.9 39.5,-379.9"/>
-<text text-anchor="middle" x="40" y="-343" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_b20&#45;&gt;Con_18 -->
-<g id="edge10" class="edge">
-<title>Phi_b20&#45;&gt;Con_18</title>
-<path fill="none" stroke="black" d="M55.87,-338.02C66.93,-350.92 83.04,-369.71 95.65,-384.42"/>
-<polygon fill="black" stroke="black" points="93.07,-386.8 102.24,-392.11 98.39,-382.24 93.07,-386.8"/>
-<text text-anchor="middle" x="52.87" y="-340.62" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_b20&#45;&gt;Region19 -->
-<g id="edge8" class="edge">
-<title>Phi_b20&#45;&gt;Region19</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M57.22,-306.43C65.37,-298.68 76.29,-290.11 88,-286 129.52,-271.44 244.06,-272.69 286,-286 293.99,-288.54 301.81,-292.83 308.83,-297.58"/>
-<polygon fill="black" stroke="black" points="307.11,-300.66 317.24,-303.75 311.25,-295.01 307.11,-300.66"/>
-<text text-anchor="middle" x="54.22" y="-300.03" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Region21 -->
-<g id="node12" class="node">
-<title>Region21</title>
-<polygon fill="yellow" stroke="black" points="352,-268 286,-268 286,-232 352,-232 352,-268"/>
-<text text-anchor="middle" x="319" y="-246.3" font-family="Times,serif" font-size="14.00">Region</text>
-</g>
-<!-- Region21&#45;&gt;If8 -->
-<g id="edge12" class="edge">
-<title>Region21&#45;&gt;If8:p1</title>
-<path fill="none" stroke="red" d="M347.26,-268.03C359.43,-277.04 372.37,-289.3 379,-304 385.58,-318.6 394.79,-373.07 378,-440 373.59,-457.56 360.94,-461.07 356.53,-473.94"/>
-<polygon fill="red" stroke="red" points="353.05,-473.59 355,-484 359.97,-474.64 353.05,-473.59"/>
-<text text-anchor="middle" x="344.26" y="-270.63" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Region21&#45;&gt;Region19 -->
-<g id="edge11" class="edge">
-<title>Region21&#45;&gt;Region19</title>
-<path fill="none" stroke="red" d="M323.45,-268.3C325.45,-276.1 327.87,-285.49 330.1,-294.17"/>
-<polygon fill="red" stroke="red" points="326.72,-295.08 332.6,-303.9 333.5,-293.34 326.72,-295.08"/>
-<text text-anchor="middle" x="320.45" y="-270.9" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_a22 -->
-<g id="node13" class="node">
-<title>Phi_a22</title>
-<ellipse fill="lightyellow" stroke="black" cx="241" cy="-250" rx="27" ry="18"/>
-<text text-anchor="middle" x="241" y="-246.3" font-family="Times,serif" font-size="14.00">φ_a</text>
-</g>
-<!-- Phi_a22&#45;&gt;Con_6 -->
-<g id="edge15" class="edge">
-<title>Phi_a22&#45;&gt;Con_6</title>
-<path fill="none" stroke="black" d="M245.36,-267.95C247.39,-275.86 249.86,-285.46 252.14,-294.31"/>
-<polygon fill="black" stroke="black" points="248.8,-295.4 254.68,-304.21 255.58,-293.65 248.8,-295.4"/>
-<text text-anchor="middle" x="242.36" y="-270.55" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_a22&#45;&gt;Con_12 -->
-<g id="edge14" class="edge">
-<title>Phi_a22&#45;&gt;Con_12</title>
-<path fill="none" stroke="black" d="M229.02,-266.54C222.02,-275.6 213.06,-287.21 205.21,-297.39"/>
-<polygon fill="black" stroke="black" points="202.29,-295.45 198.95,-305.51 207.83,-299.73 202.29,-295.45"/>
-<text text-anchor="middle" x="226.02" y="-269.14" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_a22&#45;&gt;Region21 -->
-<g id="edge13" class="edge">
-<title>Phi_a22&#45;&gt;Region21</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M268.12,-250C270.58,-250 273.04,-250 275.5,-250"/>
-<polygon fill="black" stroke="black" points="275.61,-253.5 285.61,-250 275.61,-246.5 275.61,-253.5"/>
-<text text-anchor="middle" x="271.12" y="-243.6" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Phi_b23 -->
-<g id="node14" class="node">
-<title>Phi_b23</title>
-<ellipse fill="lightyellow" stroke="black" cx="133" cy="-250" rx="27.1" ry="18"/>
-<text text-anchor="middle" x="133" y="-246.3" font-family="Times,serif" font-size="14.00">φ_b</text>
-</g>
-<!-- Phi_b23&#45;&gt;Con_7 -->
-<g id="edge18" class="edge">
-<title>Phi_b23&#45;&gt;Con_7</title>
-<path fill="none" stroke="black" d="M128.64,-267.95C126.61,-275.86 124.14,-285.46 121.86,-294.31"/>
-<polygon fill="black" stroke="black" points="118.42,-293.65 119.32,-304.21 125.2,-295.4 118.42,-293.65"/>
-<text text-anchor="middle" x="125.64" y="-270.55" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Phi_b23&#45;&gt;Phi_b20 -->
-<g id="edge17" class="edge">
-<title>Phi_b23&#45;&gt;Phi_b20</title>
-<path fill="none" stroke="black" d="M116.07,-264.17C102.58,-274.66 83.49,-289.51 68.2,-301.4"/>
-<polygon fill="black" stroke="black" points="65.9,-298.75 60.16,-307.65 70.2,-304.28 65.9,-298.75"/>
-<text text-anchor="middle" x="113.07" y="-266.77" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Phi_b23&#45;&gt;Region21 -->
-<g id="edge16" class="edge">
-<title>Phi_b23&#45;&gt;Region21</title>
-<path fill="none" stroke="black" stroke-dasharray="1,5" d="M152.84,-237.61C179.31,-222.7 227.54,-201.16 268,-214 275.99,-216.54 283.81,-220.83 290.83,-225.58"/>
-<polygon fill="black" stroke="black" points="289.11,-228.66 299.24,-231.75 293.25,-223.01 289.11,-228.66"/>
-<text text-anchor="middle" x="149.84" y="-231.21" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Add24 -->
-<g id="node15" class="node">
-<title>Add24</title>
-<ellipse fill="none" stroke="black" cx="241" cy="-178" rx="27" ry="18"/>
-<text text-anchor="middle" x="241" y="-174.3" font-family="Times,serif" font-size="14.00">+</text>
-</g>
-<!-- Add24&#45;&gt;Phi_a22 -->
-<g id="edge20" class="edge">
-<title>Add24&#45;&gt;Phi_a22</title>
-<path fill="none" stroke="black" d="M241,-196.3C241,-204.02 241,-213.29 241,-221.89"/>
-<polygon fill="black" stroke="black" points="237.5,-221.9 241,-231.9 244.5,-221.9 237.5,-221.9"/>
-<text text-anchor="middle" x="238" y="-198.9" font-family="Helvetica,sans-Serif" font-size="8.00">2</text>
-</g>
-<!-- Add24&#45;&gt;Phi_b23 -->
-<g id="edge19" class="edge">
-<title>Add24&#45;&gt;Phi_b23</title>
-<path fill="none" stroke="black" d="M222.19,-191.19C205.1,-202.27 179.69,-218.74 160.36,-231.27"/>
-<polygon fill="black" stroke="black" points="158.45,-228.34 151.96,-236.71 162.25,-234.21 158.45,-228.34"/>
-<text text-anchor="middle" x="219.19" y="-193.79" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-<!-- Return25&#45;&gt;Region21 -->
-<g id="edge21" class="edge">
-<title>Return25&#45;&gt;Region21</title>
-<path fill="none" stroke="red" d="M277.67,-124.13C285.71,-148.44 300.52,-193.18 310.06,-221.99"/>
-<polygon fill="red" stroke="red" points="306.85,-223.42 313.31,-231.81 313.49,-221.22 306.85,-223.42"/>
-<text text-anchor="middle" x="274.67" y="-126.73" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Return25&#45;&gt;Add24 -->
-<g id="edge22" class="edge">
-<title>Return25&#45;&gt;Add24</title>
-<path fill="none" stroke="black" d="M264.34,-124.3C260.76,-132.39 256.42,-142.19 252.46,-151.13"/>
-<polygon fill="black" stroke="black" points="249.21,-149.82 248.36,-160.38 255.61,-152.65 249.21,-149.82"/>
-<text text-anchor="middle" x="261.34" y="-126.9" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-</g>
-</svg>
+<svg aria-label="Compiler graph" width="1086" height="1042" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1086 1042" 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="608" height="664" fill="#f2f7ef"/></g><g class="region" transform="translate(227,358)"><rect class="region-box" rx="8" width="360" height="250" fill="#f2f7ef"/></g></g><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e3i0" d="M206,941 C206,965 543,968 543,992" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #25 · CTRL</title></path><path class="edge CTRL" id="e8i0" d="M116,118 L116,205" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#8[0] → #1 · CTRL</title></path><path class="edge DATA" id="e8i1" d="M236,118 L236,138 L196,138 L196,205" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#8[1] → #4 · DATA</title></path><path class="edge CTRL" id="e13i0" d="M96,305 L96,315 L319,315 L319,392" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#13[0] → #5 · CTRL</title></path><path class="edge DATA" id="e13i1" d="M236,118 L236,138 L399,138 L399,392" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#13[1] → #4 · DATA</title></path><path class="edge CTRL" id="e19i1" d="M299,492 L299,502 L363,502 L363,540" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#19[1] → #10 · CTRL</title></path><path class="edge CTRL" id="e19i2" d="M419,492 L419,502 L393,502 L393,540" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#19[2] → #11 · CTRL</title></path><path class="edge DATA" id="e20i1" d="M394,118 L394,128 L495,128 L495,540" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#20[1] → #17 · DATA</title></path><path class="edge DATA" id="e20i2" d="M546,118 L546,128 L535,128 L535,540" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#20[2] → #18 · DATA</title></path><path class="edge CTRL" id="e21i1" d="M363,596 L363,623 L186,623 L186,663" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[1] → #19 · CTRL</title></path><path class="edge CTRL" id="e21i2" d="M216,305 L216,663" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#21[2] → #9 · CTRL</title></path><path class="edge DATA" id="e22i1" d="M698,118 L698,128 L597,128 L597,633 L318,633 L318,663" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[1] → #12 · DATA</title></path><path class="edge DATA" id="e22i2" d="M850,118 L850,138 L608,138 L608,643 L358,643 L358,663" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#22[2] → #6 · DATA</title></path><path class="edge DATA" id="e23i1" d="M515,596 L515,623 L470,623 L470,663" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#23[1] → #20 · DATA</title></path><path class="edge DATA" id="e23i2" d="M1002,118 L1002,148 L619,148 L619,653 L510,653 L510,663" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#23[2] → #7 · DATA</title></path><path class="edge DATA" id="e24i1" d="M490,719 L490,729 L308,729 L308,767" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#24[1] → #23 · DATA</title></path><path class="edge DATA" id="e24i2" d="M338,719 L338,767" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#24[2] → #22 · DATA</title></path><path class="edge CTRL" id="e25i0" d="M186,719 L186,888" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#25[0] → #21 · CTRL</title></path><path class="edge DATA" id="e25i1" d="M308,823 L308,850 L226,850 L226,888" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#25[1] → #24 · 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(56,68)" 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(56,24)" 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(507,992)" 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] → #25  CTRL</title><circle class="port" cx="36" cy="0" r="3" fill="#536477"/><text class="slot" x="36" y="-7" text-anchor="middle">0</text></g><g class="node" id="n4" data-id="4" transform="translate(176,68)" 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(36,255)" 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 #8
+Type not computed
+
+[0] → #8  CTRL</title></g><g class="node" id="n6" data-id="6" transform="translate(790,68)" 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(942,68)" 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">  #7</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 #1
+Type not computed
+
+</title></g><g class="node" id="n8" data-id="8" transform="translate(36,211)" 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">  #8</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#8 If
+Type not computed
+
+[0] → #1  CTRL
+[1] → #4  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="n9" data-id="9" transform="translate(156,255)" 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 #8
+Type not computed
+
+[0] → #8  CTRL</title></g><g class="node" id="n10" data-id="10" transform="translate(239,442)" 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 #13
+Type not computed
+
+[0] → #13  CTRL</title></g><g class="node" id="n11" data-id="11" transform="translate(359,442)" 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">  #11/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 False
+Projection 1 of #13
+Type not computed
+
+[0] → #13  CTRL</title></g><g class="node" id="n12" data-id="12" transform="translate(638,68)" 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">  #12</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#12 #2
+Type not computed
+
+</title></g><g class="node" id="n13" data-id="13" transform="translate(239,398)" 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">  #13</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#13 If
+Type not computed
+
+[0] → #5  CTRL
+[1] → #4  DATA</title><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><circle class="port" cx="160" cy="-3" r="3" fill="#536477"/><text class="slot" x="80" y="-10" text-anchor="middle">0</text><text class="slot" x="160" y="-10" text-anchor="middle">1</text></g><g class="node" id="n17" data-id="17" transform="translate(334,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#2</tspan><tspan class="node-id">  #17</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#17 #2
+Type not computed
+
+</title></g><g class="node" id="n18" data-id="18" transform="translate(486,68)" 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">  #18</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#18 #3
+Type not computed
+
+</title></g><g class="node" id="n19" data-id="19" transform="translate(303,546)" 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">  #19</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#19 Region
+Type not computed
+
+[0] → —  DATA
+[1] → #10  CTRL
+[2] → #11  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="n20" data-id="20" transform="translate(455,546)" 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">  #20</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#20 φ_b
+Type not computed
+
+[0] → #19  ASSOC
+[1] → #17  DATA
+[2] → #18  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] → #19</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="n21" data-id="21" transform="translate(126,669)" 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">  #21</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#21 Region
+Type not computed
+
+[0] → —  DATA
+[1] → #19  CTRL
+[2] → #9  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="n22" data-id="22" transform="translate(278,669)" 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">  #22</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#22 φ_a
+Type not computed
+
+[0] → #21  ASSOC
+[1] → #12  DATA
+[2] → #6  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="n23" data-id="23" transform="translate(430,669)" 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">  #23</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#23 φ_b
+Type not computed
+
+[0] → #21  ASSOC
+[1] → #20  DATA
+[2] → #7  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="n24" data-id="24" transform="translate(248,773)" 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">  #24</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#24 +
+Type not computed
+
+[0] → —  DATA
+[1] → #23  DATA
+[2] → #22  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n25" data-id="25" transform="translate(146,894)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #25</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#25 Return
+Type not computed
+
+[0] → #21  CTRL
+[1] → #24  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>If</tspan><tspan class="node-id">  #8</tspan></text><title>If · 12 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(227,358)"><text class="label" x="26" y="17"><tspan>If</tspan><tspan class="node-id">  #13</tspan></text><title>If · 5 nodes</title><g class="fold-btn" role="button" tabindex="0" transform="translate(4,4)" aria-label="Fold region #13"><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>
-- 
cgit v1.2.3