> One thing to watch out for is that the generators returned by
> automorphism_group contain symbols that may not be the actual vertices. I
> realised this once after several frustrating hours of bizarre results from
> my program. I'm not sure if this is still the case in recent versions.

Yep. I wasted 30 minutes easily on that one too. Actually the elements
are always 1...n regardless of the graph's labelling (which often
starts at 0). That's a shame.

Nathann

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