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.
Increment a number, given its digits
Back to basics 6 - Column Vector
Return 'on' or 'off'
Do you like your boss?
index of n^2 in magic(n)
Sum of odd numbers in a matrix
most frequent character
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