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.
Back to basics 1 - Saving
Split a string into chunks of specified length
Convert Fahrenheit to Celsius
Skip by a multiple
most frequent character
Find the index of n in magic(n)
index of n^2 in magic(n)
interesting center of magic matrix
Sum of odd numbers in a matrix
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