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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.
the sample tests are missing examples where the output lists/arrays aren't "naturally sorted" (to help the guy who doesn't actually read the description to spot the actual requirements... x) )