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<!-- LSX -->
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<!-- 1 BSD -->
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<!-- Mini Unix -->
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<!-- Interdata -->
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<!-- USG 1.0 -->
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<!-- 2 BSD -->
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<!-- 1 BSD->2 BSD -->
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<!-- 7th Edition -->
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<!-- Interdata->7th Edition -->
<g id="edge10" class="edge"><title>Interdata->7th Edition</title>
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<!-- TS 4.0 -->
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<!-- PWB 2.0->Unix/TS 3.0 -->
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<!-- 8th Edition -->
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<!-- 7th Edition->8th Edition -->
<g id="edge11" class="edge"><title>7th Edition->8th Edition</title>
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<!-- 32V -->
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<!-- 7th Edition->32V -->
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<!-- V7M -->
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<!-- 7th Edition->V7M -->
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<!-- Ultrix-11 -->
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<!-- 7th Edition->Ultrix-11 -->
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<!-- Xenix -->
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<!-- 7th Edition->Xenix -->
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<!-- UniPlus+ -->
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<!-- 7th Edition->UniPlus+ -->
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<!-- 9th Edition -->
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<!-- 8th Edition->9th Edition -->
<g id="edge18" class="edge"><title>8th Edition->9th Edition</title>
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<!-- 3 BSD -->
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<!-- 32V->3 BSD -->
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<!-- V7M->Ultrix-11 -->
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<!-- 2.8 BSD -->
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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 -->
<g id="edge24" class="edge"><title>3 BSD->4 BSD</title>
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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 -->
<g id="edge28" class="edge"><title>4.1 BSD->8th Edition</title>
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<!-- 4.1 BSD->2.8 BSD -->
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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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<text text-anchor="middle" x="324.897" y="-86.3" font-family="Times,serif" font-size="14.00">Ultrix-32</text>
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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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<!-- PWB 1.2->PWB 2.0 -->
<g id="edge33" class="edge"><title>PWB 1.2->PWB 2.0</title>
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<!-- CB Unix 1 -->
<g id="node30" class="node"><title>CB Unix 1</title>
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<text text-anchor="middle" x="833.897" y="-518.3" font-family="Times,serif" font-size="14.00">CB Unix 1</text>
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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 2.0 -->
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<text text-anchor="middle" x="699.897" y="-518.3" font-family="Times,serif" font-size="14.00">USG 2.0</text>
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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 2 -->
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<text text-anchor="middle" x="853.897" y="-446.3" font-family="Times,serif" font-size="14.00">CB Unix 2</text>
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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 3.0 -->
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<text text-anchor="middle" x="616.897" y="-446.3" font-family="Times,serif" font-size="14.00">USG 3.0</text>
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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 -->
<g id="node33" class="node"><title>CB Unix 3</title>
<ellipse fill="none" stroke="black" cx="795.897" cy="-378" rx="49.2915" ry="18"/>
<text text-anchor="middle" x="795.897" y="-374.3" font-family="Times,serif" font-size="14.00">CB Unix 3</text>
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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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<text text-anchor="middle" x="752.897" y="-302.3" font-family="Times,serif" font-size="14.00">Unix/TS++</text>
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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 -->
<g id="node35" class="node"><title>PDP-11 Sys V</title>
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<text text-anchor="middle" x="884.897" y="-302.3" font-family="Times,serif" font-size="14.00">PDP-11 Sys V</text>
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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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<!-- USG 3.0->Unix/TS 3.0 -->
<g id="edge41" class="edge"><title>USG 3.0->Unix/TS 3.0</title>
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<!-- Unix/TS 1.0 -->
<g id="node37" class="node"><title>Unix/TS 1.0</title>
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<text text-anchor="middle" x="731.897" y="-446.3" font-family="Times,serif" font-size="14.00">Unix/TS 1.0</text>
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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 -->
<g id="node39" class="node"><title>System V.0</title>
<ellipse fill="none" stroke="black" cx="672.897" cy="-162" rx="52.7911" ry="18"/>
<text text-anchor="middle" x="672.897" y="-158.3" font-family="Times,serif" font-size="14.00">System V.0</text>
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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.2 -->
<g id="node40" class="node"><title>System V.2</title>
<ellipse fill="none" stroke="black" cx="672.897" cy="-90" rx="52.7911" ry="18"/>
<text text-anchor="middle" x="672.897" y="-86.3" font-family="Times,serif" font-size="14.00">System V.2</text>
</g>
<!-- 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.3 -->
<g id="node41" class="node"><title>System V.3</title>
<ellipse fill="none" stroke="black" cx="672.897" cy="-18" rx="52.7911" ry="18"/>
<text text-anchor="middle" x="672.897" y="-14.3" font-family="Times,serif" font-size="14.00">System V.3</text>
</g>
<!-- System V.2->System V.3 -->
<g id="edge49" class="edge"><title>System V.2->System V.3</title>
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