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
Set a Soroban Abacus
Differential equations I
Find the sum of the elements in the "second" diagonal
Convert a numerical matrix into a cell array of strings
Is this matrix orthogonal?
Test Driven Solution - Probability Problem 1
Restricted Multiplication v1
Restricted Addition v3
Restricted Addition v2
Test Driven Solution - Probability Problem 2
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