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/* Add edges from input graph to argument graph
* Does not add nodes.
*/
BEGIN{
graph_t g = readG(ARGV[0]);
node_t h, t;
edge_t e;
}
E {
if ((h = isNode(g,head.name)) && (t = isNode(g,tail.name))) {
if (!isEdge(t,h,"")) {
e = copy(g,$);
}
}
}
END {
write(g);
}