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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.
Got a test fail for [0, 0, 3], 15. The error says the expected output is 0. Expected output should be null. 0 is not a valid output in the instructions.