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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.
This is less efficient than the second solution. The complexity is O(n^2) for this one, while the complexity of the the second one is O(n). (count has a complexity of O(n)).
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