[Nauty-list] Directed graphs with loops

Sterten at aol.com Sterten at aol.com
Sun Sep 12 17:00:30 EST 2010

genbg n n
gives bipartite graphs with 2 fixed groups
if permutations in one group are disallowed (considered  non-isomorphic)
then this should give the digraphs with loops
(identify with one group)
can it be done easily to exclude permutations in one group ? 
Force the same permutation in group 2 as in group  1
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