UPDATE: ARGH sorry this reply was meant for the OP!

Thats really not trivial and more complicated than I thought because of edge cases (not covered in your sample code)

So I can fully recommend using an already tested and optimized graph module because all solutions I had so far need to be rewritten for performance reasons...

Cheers Rolf

In reply to Re^2: Finding all connected nodes in an all-against-all comparison by LanX
in thread Finding all connected nodes in an all-against-all comparison by Anonymous Monk

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