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 of diagonal of a square matrix
Sum the elements in either diagonal of a square matrix
Find the index of n in magic(n)
Union of two set decreasing order
interesting center of magic matrix
index of n^2 in magic(n)
Alternately upper-lower case
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