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.
Summing Digits within Text
All your base are belong to us
Make an awesome ramp for a tiny motorcycle stuntman
Check if number exists in vector
Product of Array
Sum of odd numbers in a matrix
execute the declaration in strings and return value
interesting center of magic matrix
most frequent character
index of n^2 in magic(n)
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