/usr/share/doc/graphviz/examples/graphs/directed/clust1.gv is in graphviz-doc 2.38.0-7.
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1 2 3 4 5 6 7 8 | digraph G {
subgraph cluster_c0 {a0 -> a1 -> a2 -> a3;}
subgraph cluster_c1 {b0 -> b1 -> b2 -> b3;}
x -> a0;
x -> b0;
a1 -> a3;
a3 -> a0;
}
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