ksgi

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digraph {
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	rankdir="LR";
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	subgraph cluster0 {
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		graph[rankdir="TB",style="invis"];
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		node[shape="plaintext"];
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		start[label="promises"];
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		forkop[label="\"stdio proc unix sendfd\""];
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		acceptop[label="\"stdio unix sendfd\""];
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		recvop[label="\"stdio sendfd\""];
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		readop[label="\"stdio\""];
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	}
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	subgraph cluster1 {
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		graph[rankdir="TB"];
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		start2[label="operations", shape="plaintext"];
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		forkop2[label="fork(2)"];
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		acceptop2[label="accept(2)"];
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		recvop2[label="recvmsg(2)"];
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		readop2[label="read(2)"];
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	}
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	start -> start2[style="invis"];
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	forkop -> forkop2[style="invis"];
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}
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