<?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 2.34.0 (20131125.0033)
 -->
<!-- Title: G Pages: 1 -->
<svg width="172pt" height="420pt"
 viewBox="0.00 0.00 172.00 420.00" 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(4 416)">
<title>G</title>
<polygon fill="white" stroke="white" points="-4,4 -4,-416 168,-416 168,4 -4,4"/>
<g id="clust1" class="cluster"><title>cluster_c0</title>
<polygon fill="none" stroke="black" points="86,-8 86,-276 156,-276 156,-8 86,-8"/>
</g>
<g id="clust2" class="cluster"><title>cluster_c1</title>
<polygon fill="none" stroke="black" points="8,-80 8,-348 78,-348 78,-80 8,-80"/>
</g>
<!-- a0 -->
<g id="node1" class="node"><title>a0</title>
<ellipse fill="none" stroke="black" cx="121" cy="-250" rx="27" ry="18"/>
<text text-anchor="middle" x="121" y="-246.3" font-family="Times,serif" font-size="14.00">a0</text>
</g>
<!-- a1 -->
<g id="node2" class="node"><title>a1</title>
<ellipse fill="none" stroke="black" cx="121" cy="-178" rx="27" ry="18"/>
<text text-anchor="middle" x="121" y="-174.3" font-family="Times,serif" font-size="14.00">a1</text>
</g>
<!-- a0&#45;&gt;a1 -->
<g id="edge1" class="edge"><title>a0&#45;&gt;a1</title>
<path fill="none" stroke="black" d="M121,-231.697C121,-223.983 121,-214.712 121,-206.112"/>
<polygon fill="black" stroke="black" points="124.5,-206.104 121,-196.104 117.5,-206.104 124.5,-206.104"/>
</g>
<!-- a2 -->
<g id="node3" class="node"><title>a2</title>
<ellipse fill="none" stroke="black" cx="121" cy="-106" rx="27" ry="18"/>
<text text-anchor="middle" x="121" y="-102.3" font-family="Times,serif" font-size="14.00">a2</text>
</g>
<!-- a1&#45;&gt;a2 -->
<g id="edge2" class="edge"><title>a1&#45;&gt;a2</title>
<path fill="none" stroke="black" d="M121,-159.697C121,-151.983 121,-142.712 121,-134.112"/>
<polygon fill="black" stroke="black" points="124.5,-134.104 121,-124.104 117.5,-134.104 124.5,-134.104"/>
</g>
<!-- b3 -->
<g id="node8" class="node"><title>b3</title>
<ellipse fill="none" stroke="black" cx="43" cy="-106" rx="27" ry="18"/>
<text text-anchor="middle" x="43" y="-102.3" font-family="Times,serif" font-size="14.00">b3</text>
</g>
<!-- a1&#45;&gt;b3 -->
<g id="edge9" class="edge"><title>a1&#45;&gt;b3</title>
<path fill="none" stroke="black" d="M109.409,-161.465C98.9137,-150.924 83.4334,-136.931 69.9701,-125.767"/>
<polygon fill="black" stroke="black" points="71.884,-122.813 61.9105,-119.238 67.4777,-128.252 71.884,-122.813"/>
</g>
<!-- a3 -->
<g id="node4" class="node"><title>a3</title>
<ellipse fill="none" stroke="black" cx="121" cy="-34" rx="27" ry="18"/>
<text text-anchor="middle" x="121" y="-30.3" font-family="Times,serif" font-size="14.00">a3</text>
</g>
<!-- a2&#45;&gt;a3 -->
<g id="edge3" class="edge"><title>a2&#45;&gt;a3</title>
<path fill="none" stroke="black" d="M121,-87.6966C121,-79.9827 121,-70.7125 121,-62.1124"/>
<polygon fill="black" stroke="black" points="124.5,-62.1043 121,-52.1043 117.5,-62.1044 124.5,-62.1043"/>
</g>
<!-- b0 -->
<g id="node5" class="node"><title>b0</title>
<ellipse fill="none" stroke="black" cx="43" cy="-322" rx="27" ry="18"/>
<text text-anchor="middle" x="43" y="-318.3" font-family="Times,serif" font-size="14.00">b0</text>
</g>
<!-- b1 -->
<g id="node6" class="node"><title>b1</title>
<ellipse fill="none" stroke="black" cx="43" cy="-250" rx="27" ry="18"/>
<text text-anchor="middle" x="43" y="-246.3" font-family="Times,serif" font-size="14.00">b1</text>
</g>
<!-- b0&#45;&gt;b1 -->
<g id="edge4" class="edge"><title>b0&#45;&gt;b1</title>
<path fill="none" stroke="black" d="M43,-303.697C43,-295.983 43,-286.712 43,-278.112"/>
<polygon fill="black" stroke="black" points="46.5001,-278.104 43,-268.104 39.5001,-278.104 46.5001,-278.104"/>
</g>
<!-- b2 -->
<g id="node7" class="node"><title>b2</title>
<ellipse fill="none" stroke="black" cx="43" cy="-178" rx="27" ry="18"/>
<text text-anchor="middle" x="43" y="-174.3" font-family="Times,serif" font-size="14.00">b2</text>
</g>
<!-- b1&#45;&gt;b2 -->
<g id="edge5" class="edge"><title>b1&#45;&gt;b2</title>
<path fill="none" stroke="black" d="M43,-231.697C43,-223.983 43,-214.712 43,-206.112"/>
<polygon fill="black" stroke="black" points="46.5001,-206.104 43,-196.104 39.5001,-206.104 46.5001,-206.104"/>
</g>
<!-- b2&#45;&gt;b3 -->
<g id="edge6" class="edge"><title>b2&#45;&gt;b3</title>
<path fill="none" stroke="black" d="M43,-159.697C43,-151.983 43,-142.712 43,-134.112"/>
<polygon fill="black" stroke="black" points="46.5001,-134.104 43,-124.104 39.5001,-134.104 46.5001,-134.104"/>
</g>
<!-- b3&#45;&gt;a1 -->
<g id="edge10" class="edge"><title>b3&#45;&gt;a1</title>
<path fill="none" stroke="black" d="M54.5367,-122.481C65.0434,-133.038 80.574,-147.078 94.0697,-158.266"/>
<polygon fill="black" stroke="black" points="92.1726,-161.233 102.147,-164.807 96.5781,-155.793 92.1726,-161.233"/>
</g>
<!-- x -->
<g id="node9" class="node"><title>x</title>
<ellipse fill="none" stroke="black" cx="76" cy="-394" rx="27" ry="18"/>
<text text-anchor="middle" x="76" y="-390.3" font-family="Times,serif" font-size="14.00">x</text>
</g>
<!-- x&#45;&gt;a0 -->
<g id="edge7" class="edge"><title>x&#45;&gt;a0</title>
<path fill="none" stroke="black" d="M81.3388,-376.153C89.0522,-351.813 103.39,-306.568 112.55,-277.665"/>
<polygon fill="black" stroke="black" points="115.984,-278.415 115.668,-267.825 109.311,-276.3 115.984,-278.415"/>
</g>
<!-- x&#45;&gt;b0 -->
<g id="edge8" class="edge"><title>x&#45;&gt;b0</title>
<path fill="none" stroke="black" d="M68.1795,-376.411C64.2752,-368.129 59.4646,-357.925 55.0978,-348.662"/>
<polygon fill="black" stroke="black" points="58.1945,-347.023 50.7644,-339.47 51.8628,-350.008 58.1945,-347.023"/>
</g>
</g>
</svg>