nice (and difficult) problem! (if possible, please fix the testsuite adding something along the lines of "assert(n==numel(unique(c)))")
example of invalid solution
Return the largest number that is adjacent to a zero
Remove all the words that end with "ain"
Poker Series 08: IsPair
Stuff the Board
Next lexicographic - permutation
Restricted Multiplication v1
Restricted Addition v2
Restricted Addition v1
Restricted Addition v4
Restricted Subtraction v1
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