[Nauty] forbidden subgraphs in directed graphs

[Sterten at aol.com]

I think, we talked about this some time ago, I don't remember  exactly.
Or maybe there is something new...
 
I can do this with undirected graphs using geng, but I need it with
directed graphs too.
 
e.g. I want all acyclic digraphs not containing the "N" digraph   
1->2,3->2,3->4
 
 
 
Guenter.
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