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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.
(Python) I couldn't satisfy the time requirement after attempting this problem for hours, so I just unlocked the solutions.
I used the top rated solution and it still timed out for me after 445 tests...