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.
Bottles of beer
Back to basics 18 - justification
Calculate the area of a triangle between three points
Celsius to Kelvin
Check if equal
Find the index of n in magic(n)
Alternately upper-lower case
Sum of odd numbers in a matrix
execute the declaration in strings and return value
interesting center of magic matrix
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