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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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I believe that by using includes, the code will have to check the entirety of b array for each the value of array a, resulting in time complexity of O(n * m)
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