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.
Prime factor digits
Back to basics 15 - classes
Arrange vector in ascending order
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Add a row of zeros on top of a matrix
execute the declaration in strings and return value
index of n^2 in magic(n)
Sum of odd numbers in a matrix
most frequent character
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