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
Return the first and last character of a string
Change the first and last diagonal element of the identity matrix to zero
Alternately upper-lower case
index of n^2 in magic(n)
Sum of odd numbers in a matrix
most frequent character
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