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.
Sum the numbers on the main diagonal
Simple equation: Annual salary
Find nth maximum
Solving Quadratic Equations (Version 1)
Divide by 4
Sum of odd numbers in a matrix
index of n^2 in magic(n)
Find the index of n in magic(n)
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