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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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your reference solution is incorrect with the new requirements:
Please, remove this note, there're no performance requirements at all. It is your own solution that is so insanely slow that it can't pass the tests from time to time.
Practically a duplicate of this.