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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.
That means your 1 line solution is inefficient. You can solve this in O(1) time complexity, and it probably shouldn't take you more than 1 line to do it.
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