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.
Equal to their cube
07 - Common functions and indexing 4
Sum of series I
Speed of car
execute the declaration in strings and return value
Alternately upper-lower case
interesting center of magic matrix
index of n^2 in magic(n)
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