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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.
It should be specifically mentioned that there's no need to return item as an array. Also, despite having the completely correct answer in my array, the kata only seems to pick up the initial value of the array.