Related problem: I end up with a list of `(1, 2, [...

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[mbickel]

Related problem: I end up with a list of (1, 2, [‘a’]), (2, 3, [‘a’]), (1, 2, [‘b’]) triplets. What I need is (1, 2, [‘a’, ‘b’]), (2, 3, [‘a’]). Is there a idiomatic way to act on the extra elements? I can come up with an ugly way, a nested for loop with a mutable list and some other troubled things but I was looking for a more functional approach.