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
Sums with Excluded Digits
Bottles of beer
old wine in a new bottle?
Encoding Google Maps Polylines
Restricted Subtraction v1
Restricted Multiplication v1
Restricted Addition v4
Test Driven Solution - Probability Problem 3
Restricted Addition v3
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