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.
Determine whether a vector is monotonically increasing
Back to basics 21 - Matrix replicating
Convert a vector into a number
Output any real number that is neither positive nor negative
The sum of the numbers in the vector
interesting center of magic matrix
Alternately upper-lower case
index of n^2 in magic(n)
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