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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.
Simply great. No allocated objects and as such very high performance as long as the input isn't a very big array with a cycle at the beginning. Definitely best practice and clever!
Fails to handle "(x)".