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Sep
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awarded  Student
Sep
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revised Perfoming permutation count
Improved question
Sep
5
comment Perfoming permutation count
You have 9 characters and you need to perform all the possible permutations in 4 columns (e.g. 'a, b, d, e') such that you never get repetition of the same character in a single string of the 4 column characters.
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awarded  Editor
Sep
5
revised Perfoming permutation count
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asked Perfoming permutation count