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.
Times 2 - START HERE
Remove any row in which a NaN appears
Is A the inverse of B?
Flip the vector from right to left
interesting center of magic matrix
Sum of odd numbers in a matrix
index of n^2 in magic(n)
most frequent character
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