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Editing: collapse
/* Collapse all edges with same group attribute into a single edge */ BEG_G { int seen[string]; $O = $; // Use the input graph as output. } E { if (collapse == "") return; // If no collapse, ignore. if (seen[collapse]) delete ($G, $); // If already seen an edge with this collapse value, // delete the edge. else seen[collapse] = 1; // Else mark collapse value as seen and keep edge. }
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