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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.
The inner loop runs duplicate times, the code can be reduced to O(n)
Concise code, however, naming such as mm is a bit confunsing.