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docs: fix permutations README grammar
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‎src/algorithms/sets/permutations/README.md‎

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@@ -27,7 +27,7 @@ n * (n-1) * (n -2) * ... * 1 = n!
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## Permutations with repetitions
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When repetition is allowed we have permutations with repetitions.
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For example the the lock below: it could be `333`.
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For example, the lock below could be `333`.
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![Permutation Lock](https://www.mathsisfun.com/combinatorics/images/permutation-lock.jpg)
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