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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.
WEII DONE!!
I know it's trivial, but how is mutating the original arrays being accepted as a valid solution?. Likewise for most of the other answers here