You're welcome - glad you found this useful. I don't know whether there will be a problem if it isn't being maintained anymore. Its such a useful module, so that surprises me.

I am not well versed on the use of this module. All I've learned is from examples here on Perl Monks. For example, I don't know if your chains could have been constructed using a Directed graph. I've seen an example solving a problem using a directed graph but I found a solution to your problem using an undirected graph,