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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.
Just saying, but I solved this per the instructions, and still failed. The instructions only state that the code needs to satisfy the example tests in any order. My code did that, but failed because my code doesn't pass the random tests. Maybe the description could be updated to reflect that?