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.
Indexed Probability Table
Back to basics 18 - justification
Whether the input is vector?
Generate a NaN...on purpose
length of a vector
Find the index of n in magic(n)
execute the declaration in strings and return value
most frequent character
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