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.
Reverse the vector
Multiply a column by a row
Set some matrix elements to zero
Given a matrix, return the last eigen value
Find the dimensions of a matrix
Sum of odd numbers in a matrix
execute the declaration in strings and return value
Alternately upper-lower case
most frequent character
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