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No, see https://www.codewars.com/kata/reviews/523f5d21c841566fde00000c/groups/64de86af1267670001b7e8f9 (javascript)
is O(a*b) the best we can get for this problem?
I think I've read something before that javascript sets aren't true or something along those lines and .has should be on average (but not all the time) faster that includes
cleaaaan
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