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<!-- 2 BSD->2.8 BSD -->
<g id="edge20" class="edge"><title>2 BSD->2.8 BSD</title>
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<!-- 2.8 BSD->Ultrix-11 -->
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<!-- 2.9 BSD -->
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<!-- 2.8 BSD->2.9 BSD -->
<g id="edge22" class="edge"><title>2.8 BSD->2.9 BSD</title>
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<!-- 4 BSD -->
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<!-- 3 BSD->4 BSD -->
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<!-- 4.1 BSD -->
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<!-- 4 BSD->4.1 BSD -->
<g id="edge25" class="edge"><title>4 BSD->4.1 BSD</title>
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<!-- 4.1 BSD->8th Edition -->
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<!-- 4.2 BSD -->
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<!-- 4.1 BSD->4.2 BSD -->
<g id="edge26" class="edge"><title>4.1 BSD->4.2 BSD</title>
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<!-- 4.3 BSD -->
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<!-- 4.2 BSD->4.3 BSD -->
<g id="edge29" class="edge"><title>4.2 BSD->4.3 BSD</title>
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<!-- Ultrix-32 -->
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<!-- 4.2 BSD->Ultrix-32 -->
<g id="edge30" class="edge"><title>4.2 BSD->Ultrix-32</title>
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<g id="edge33" class="edge"><title>PWB 1.2->PWB 2.0</title>
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<!-- CB Unix 1 -->
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<!-- USG 1.0->CB Unix 1 -->
<g id="edge34" class="edge"><title>USG 1.0->CB Unix 1</title>
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<!-- USG 1.0->USG 2.0 -->
<g id="edge35" class="edge"><title>USG 1.0->USG 2.0</title>
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<!-- CB Unix 1->CB Unix 2 -->
<g id="edge36" class="edge"><title>CB Unix 1->CB Unix 2</title>
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<!-- USG 2.0->USG 3.0 -->
<g id="edge40" class="edge"><title>USG 2.0->USG 3.0</title>
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<!-- CB Unix 3 -->
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<!-- CB Unix 2->CB Unix 3 -->
<g id="edge37" class="edge"><title>CB Unix 2->CB Unix 3</title>
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<!-- Unix/TS++ -->
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<!-- CB Unix 3->Unix/TS++ -->
<g id="edge38" class="edge"><title>CB Unix 3->Unix/TS++</title>
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<!-- PDP-11 Sys V -->
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<!-- CB Unix 3->PDP-11 Sys V -->
<g id="edge39" class="edge"><title>CB Unix 3->PDP-11 Sys V</title>
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<!-- CB Unix 3->TS 4.0 -->
<g id="edge46" class="edge"><title>CB Unix 3->TS 4.0</title>
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<!-- Unix/TS++->TS 4.0 -->
<g id="edge45" class="edge"><title>Unix/TS++->TS 4.0</title>
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<!-- Unix/TS 1.0->Unix/TS 3.0 -->
<g id="edge43" class="edge"><title>Unix/TS 1.0->Unix/TS 3.0</title>
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<!-- System V.0 -->
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<!-- TS 4.0->System V.0 -->
<g id="edge47" class="edge"><title>TS 4.0->System V.0</title>
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<!-- System V.0->System V.2 -->
<g id="edge48" class="edge"><title>System V.0->System V.2</title>
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<!-- System V.2->System V.3 -->
<g id="edge49" class="edge"><title>System V.2->System V.3</title>
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