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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.
Fun, doable kata.
Lol I don't understand any of the top solutions
Don't waste your time thinking you should only use unmutable arrays in this task.
I still don't understand my solution took me two hours an insanely complicated Xd