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 the air bubbles
Distance walked 3D
Back to basics 7 - Equal NaNs
Remove white space from the string
frame of the matrix
most frequent character
execute the declaration in strings and return value
interesting center of magic matrix
Sum of odd numbers in a matrix
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