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/* create a copy of the input graph with no multiedges */
BEG_G {
graph_t g = graph ("merge", "S");
}
E {
int wt;
node_t h = node(g,$.head.name);
node_t t = node(g,$.tail.name);
edge_t e = isEdge(t,h,"");
wt = $.weight;
if (wt <= 0) wt = 1;
if (e) {
e.weight = e.weight + wt;
}
else if (h != t) {
e = edge(t,h,"");
e.weight = wt;
}
}
END_G {
fwriteG(g,1);
}