--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/figures/figure-sg03.svg	Mon Nov 11 03:40:20 2019 +0700
@@ -0,0 +1,60 @@
+<?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 2.40.1 (20161225.0304)
+ -->
+<!-- Title: Mercurial graph Pages: 1 -->
+<svg width="427pt" height="188pt"
+ viewBox="0.00 0.00 427.00 188.00" 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(4 184)">
+<title>Mercurial graph</title>
+<!-- 0 -->
+<g id="node1" class="node">
+<title>0</title>
+<polygon fill="none" stroke="#000000" stroke-width="4" points="72,-180 0,-180 0,-144 72,-144 72,-180"/>
+<text text-anchor="middle" x="36" y="-158.3" font-family="mono" font-size="14.00" fill="#000000">0:0dc9</text>
+</g>
+<!-- 1 -->
+<g id="node2" class="node">
+<title>1</title>
+<polygon fill="none" stroke="#000000" stroke-width="2" points="216,-180 144,-180 144,-144 216,-144 216,-180"/>
+<text text-anchor="middle" x="180" y="-158.3" font-family="mono" font-size="14.00" fill="#000000">1:f649</text>
+</g>
+<!-- 0&#45;&gt;1 -->
+<g id="edge1" class="edge">
+<title>0&#45;&gt;1</title>
+<path fill="none" stroke="#000000" stroke-width="2" d="M72.3373,-162C90.9973,-162 113.9327,-162 133.8329,-162"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="2" points="133.9241,-165.5001 143.924,-162 133.924,-158.5001 133.9241,-165.5001"/>
+</g>
+<!-- 2 -->
+<g id="node3" class="node">
+<title>2</title>
+<polygon fill="none" stroke="#000000" stroke-width="2" points="216,-36 144,-36 144,0 216,0 216,-36"/>
+<text text-anchor="middle" x="180" y="-14.3" font-family="mono" font-size="14.00" fill="#000000">2:522d</text>
+</g>
+<!-- 0&#45;&gt;2 -->
+<g id="edge2" class="edge">
+<title>0&#45;&gt;2</title>
+<path fill="none" stroke="#000000" stroke-width="2" d="M54.2377,-143.7623C79.6646,-118.3354 125.8747,-72.1253 154.6431,-43.3569"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="2" points="157.3142,-45.6356 161.9104,-36.0896 152.3644,-40.6858 157.3142,-45.6356"/>
+</g>
+<!-- 1&#45;&gt;2 -->
+<g id="edge3" class="edge">
+<title>1&#45;&gt;2</title>
+<path fill="none" stroke="#000000" stroke-width="2" stroke-dasharray="5,2" d="M180,-135.7351C180,-106.8541 180,-61.2198 180,-36.0896"/>
+<ellipse fill="#000000" stroke="#000000" stroke-width="2" cx="180" cy="-139.7623" rx="4" ry="4"/>
+</g>
+<!-- T1 -->
+<g id="node4" class="node">
+<title>T1</title>
+<text text-anchor="start" x="237" y="-93.8" font-family="mono" font-style="italic" font-size="14.00" fill="#000000">obsolete (and hidden)</text>
+<text text-anchor="start" x="266" y="-79.8" font-family="mono" font-style="italic" font-size="14.00" fill="#000000">after the push</text>
+</g>
+<!-- T1&#45;&gt;1 -->
+<g id="edge4" class="edge">
+<title>T1&#45;&gt;1</title>
+<path fill="none" stroke="#c0c0c0" stroke-width="2" d="M287.6627,-108.1686C268.6604,-117.6698 245.2242,-129.3879 225.0748,-139.4626"/>
+<polygon fill="#c0c0c0" stroke="#c0c0c0" stroke-width="2" points="223.455,-136.3593 216.076,-143.962 226.5855,-142.6203 223.455,-136.3593"/>
+</g>
+</g>
+</svg>