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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.
I know the acceptance criteria specifically says the function takes an array of 10 numbers between 0-9, but this fails if the array is null or contains less than 10 items, or any of the numbers is larger than 9 or less than 0. Then again, the acceptance criteria doesn't say what to do in any of those scenarios...