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.
Project Euler: Problem 10, Sum of Primes
Replace multiples of 5 with NaN
05 - Vector Equations 1
Find the Nth Root of a Given Number
most frequent character
Find the index of n in magic(n)
index of n^2 in magic(n)
interesting center of magic matrix
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