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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.
Do not mutate your input.
Ideally, the kata should not be affected by this, but if you mutate your input, you deserve everything you get.
The user's already solved the kata.