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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.
The description says "Do not mutate the original array/list." but none of the tests verify this and the point of the excercise does not seem to actually require this.