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> Can you tell me more about what you mean by filtering by mutual paths?

I should have said mutual connections, my apologies. So if article A connects to B and article B also connects to A. I suppose you could do this mostly client-side, all you need is two searches (one the reverse of the other) and an intersection of the resulting graphs, no?

I implemented this pretty naively a while back [1]. I was interested in how yours was so fast. I expected some sort of complex heuristic; cool to see that your solution is straightforward!

[1] https://github.com/wwalexander/wikipath

I think GP wanted to find paths in both directions: X -> A -> B -> Y and Y -> C -> D -> X. Possibly where A = D and B = C.