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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 order matters when comparing arrays (unless stated otherwise), so you should keep the order they have in the original array, not reorder them as you want.
Print the input (you're printing what your function returns there). Not a kata issue.