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<!-- 1 BSD -->
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<!-- Mini Unix -->
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<!-- Interdata -->
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<!-- 7th Edition -->
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<!-- Interdata->7th Edition -->
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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 -->
<g id="edge14" class="edge"><title>7th Edition->Ultrix-11</title>
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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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<!-- 10th Edition -->
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<!-- 9th Edition->10th Edition -->
<g id="edge19" class="edge"><title>9th Edition->10th Edition</title>
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<!-- 2.8 BSD -->
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<!-- 2 BSD->2.8 BSD -->
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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="edge23" 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="edge26" class="edge"><title>4 BSD->4.1 BSD</title>
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<!-- 4.1 BSD->8th Edition -->
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<!-- 4.1 BSD->2.8 BSD -->
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<!-- 4.2 BSD -->
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<text text-anchor="middle" x="340.897" y="-230.3" font-family="Times,serif" font-size="14.00">4.2 BSD</text>
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<!-- 4.1 BSD->4.2 BSD -->
<g id="edge27" class="edge"><title>4.1 BSD->4.2 BSD</title>
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<!-- 4.3 BSD -->
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<text text-anchor="middle" x="427.897" y="-158.3" font-family="Times,serif" font-size="14.00">4.3 BSD</text>
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<!-- 4.2 BSD->4.3 BSD -->
<g id="edge30" 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="-158.3" font-family="Times,serif" font-size="14.00">Ultrix-32</text>
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<!-- 4.2 BSD->Ultrix-32 -->
<g id="edge31" class="edge"><title>4.2 BSD->Ultrix-32</title>
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<!-- 4.4 BSD -->
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<text text-anchor="middle" x="426.897" y="-86.3" font-family="Times,serif" font-size="14.00">4.4 BSD</text>
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<!-- 4.3 BSD->4.4 BSD -->
<g id="edge32" class="edge"><title>4.3 BSD->4.4 BSD</title>
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<!-- FreeBSD -->
<g id="node30" class="node"><title>FreeBSD</title>
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<text text-anchor="middle" x="324.897" y="-14.3" font-family="Times,serif" font-size="14.00">FreeBSD</text>
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<!-- 4.4 BSD->FreeBSD -->
<g id="edge33" class="edge"><title>4.4 BSD->FreeBSD</title>
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<!-- NetBSD -->
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<text text-anchor="middle" x="426.897" y="-14.3" font-family="Times,serif" font-size="14.00">NetBSD</text>
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<!-- 4.4 BSD->NetBSD -->
<g id="edge34" class="edge"><title>4.4 BSD->NetBSD</title>
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<!-- OpenBSD -->
<g id="node32" class="node"><title>OpenBSD</title>
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<text text-anchor="middle" x="531.897" y="-14.3" font-family="Times,serif" font-size="14.00">OpenBSD</text>
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<!-- 4.4 BSD->OpenBSD -->
<g id="edge35" class="edge"><title>4.4 BSD->OpenBSD</title>
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<!-- PWB 1.2->PWB 2.0 -->
<g id="edge38" class="edge"><title>PWB 1.2->PWB 2.0</title>
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<!-- CB Unix 1 -->
<g id="node35" class="node"><title>CB Unix 1</title>
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<text text-anchor="middle" x="956.897" y="-590.3" font-family="Times,serif" font-size="14.00">CB Unix 1</text>
</g>
<!-- USG 1.0->CB Unix 1 -->
<g id="edge39" class="edge"><title>USG 1.0->CB Unix 1</title>
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<!-- USG 2.0 -->
<g id="node36" class="node"><title>USG 2.0</title>
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<text text-anchor="middle" x="800.897" y="-590.3" font-family="Times,serif" font-size="14.00">USG 2.0</text>
</g>
<!-- USG 1.0->USG 2.0 -->
<g id="edge40" 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="956.897" y="-518.3" font-family="Times,serif" font-size="14.00">CB Unix 2</text>
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<!-- CB Unix 1->CB Unix 2 -->
<g id="edge41" class="edge"><title>CB Unix 1->CB Unix 2</title>
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<!-- USG 3.0 -->
<g id="node41" class="node"><title>USG 3.0</title>
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<text text-anchor="middle" x="719.897" y="-518.3" font-family="Times,serif" font-size="14.00">USG 3.0</text>
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<!-- USG 2.0->USG 3.0 -->
<g id="edge45" class="edge"><title>USG 2.0->USG 3.0</title>
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<!-- CB Unix 3 -->
<g id="node38" class="node"><title>CB Unix 3</title>
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<text text-anchor="middle" x="898.897" y="-446.3" font-family="Times,serif" font-size="14.00">CB Unix 3</text>
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<!-- CB Unix 2->CB Unix 3 -->
<g id="edge42" class="edge"><title>CB Unix 2->CB Unix 3</title>
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<!-- Unix/TS++ -->
<g id="node39" class="node"><title>Unix/TS++</title>
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<text text-anchor="middle" x="882.897" y="-374.3" font-family="Times,serif" font-size="14.00">Unix/TS++</text>
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<!-- CB Unix 3->Unix/TS++ -->
<g id="edge43" class="edge"><title>CB Unix 3->Unix/TS++</title>
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<!-- PDP-11 Sys V -->
<g id="node40" class="node"><title>PDP-11 Sys V</title>
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<text text-anchor="middle" x="1014.9" y="-374.3" 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="edge44" class="edge"><title>CB Unix 3->PDP-11 Sys V</title>
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<!-- CB Unix 3->TS 4.0 -->
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<!-- Unix/TS++->TS 4.0 -->
<g id="edge50" class="edge"><title>Unix/TS++->TS 4.0</title>
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<!-- USG 3.0->Unix/TS 3.0 -->
<g id="edge46" class="edge"><title>USG 3.0->Unix/TS 3.0</title>
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<!-- Unix/TS 1.0 -->
<g id="node42" class="node"><title>Unix/TS 1.0</title>
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<text text-anchor="middle" x="834.897" y="-518.3" 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="edge48" class="edge"><title>Unix/TS 1.0->Unix/TS 3.0</title>
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<!-- System V.0 -->
<g id="node44" class="node"><title>System V.0</title>
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<text text-anchor="middle" x="802.897" y="-230.3" font-family="Times,serif" font-size="14.00">System V.0</text>
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<!-- TS 4.0->System V.0 -->
<g id="edge52" class="edge"><title>TS 4.0->System V.0</title>
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<!-- System V.2 -->
<g id="node45" class="node"><title>System V.2</title>
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<text text-anchor="middle" x="802.897" y="-158.3" font-family="Times,serif" font-size="14.00">System V.2</text>
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<!-- System V.0->System V.2 -->
<g id="edge53" class="edge"><title>System V.0->System V.2</title>
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<!-- System V.3 -->
<g id="node46" class="node"><title>System V.3</title>
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<text text-anchor="middle" x="802.897" y="-86.3" font-family="Times,serif" font-size="14.00">System V.3</text>
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<!-- System V.2->System V.3 -->
<g id="edge54" class="edge"><title>System V.2->System V.3</title>
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<!-- System V.4 -->
<g id="node47" class="node"><title>System V.4</title>
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<text text-anchor="middle" x="802.897" y="-14.3" font-family="Times,serif" font-size="14.00">System V.4</text>
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<!-- System V.3->System V.4 -->
<g id="edge55" class="edge"><title>System V.3->System V.4</title>
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