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I had a need to summarize some networks in extended Newick format.
I still don't know how to actually summarize them [1,2], but calculating distance matrices seems a useful step to get data into network tools like SplitsTree (oh, the pain I'm inflicting on myself, it hurts!) – and for that I needed some new logic, which may hopefully also be useful in other contexts.
So.
Here is one useful new command (and one sidetrack that fell out on the way, which probably isn't useful) and one utils module for you.