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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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Is this best practice compare to this one?
https://www.codewars.com/kata/reviews/5e444a24733cf90001396219/groups/5e4e9539ffda370001a426f5
This should be the best solution, easy to read and good complexity