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
Find the palindrome
DNA N-Gram Distribution
Right and wrong
Cody Computer Part 1 - Guess the system font used by uipanel
Restricted Subtraction v1
Test Driven Solution - Probability Problem 3
Test Driven Solution - Probability Problem 1
Restricted Addition v1
Test Driven Solution - Probability Problem 2
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