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.
Generate a NaN...on purpose
Simple equation: Annual salary
Deleting an element in a matrix
Matlab Basics II - Create a vector with a repeated entry
most frequent character
Find the index of n in magic(n)
index of n^2 in magic(n)
Alternately upper-lower case
Sum of odd numbers in a matrix
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