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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.
Check the comments, this solution is at least 5 years old, and probably there were no random tests when it passed. Read Eldrad's comment below to see why it fails. Solutions automatic revalidation isn't working and this solution is invalid (as you could see) with random negative tests.