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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.
because the kata doesnt check if the original array is still intact so it doesnt matter if you modify the original array or not, because either way you will pass