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.
Finding Perfect Squares
Back to basics 19 - character types
sum of non-primes
07 - Common functions and indexing 3
Square the input
interesting center of magic matrix
Sum of odd numbers in a matrix
execute the declaration in strings and return value
most frequent character
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