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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.
Instructions are faulty, or test cases are broken.
one of the test cases provides only 4 numbers, where instructions say it will always provide 5.