I think the description and test suite on this problem is slightly off. When I see 'union' I already assume that no duplicates are permitted and order is irrelevant.
Remove any row in which a NaN appears
Make one big string out of two smaller strings
Back to basics 4 - Search Path
Length of a short side
Side of a rhombus
Find the index of n in magic(n)
index of n^2 in magic(n)
most frequent character
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