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 vowels
Back to basics 4 - Search Path
Create a vector whose elements depend on the previous element
Change the sign of even index entries of the reversed vector
subtract central cross
Sum of odd numbers in a matrix
execute the declaration in strings and return value
interesting center of magic matrix
index of n^2 in magic(n)
most frequent character
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