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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.
I'd advise testing against an uppercase to make the tests more robust and making slightly more difficult as well as testing a random to prevent hardcoding the solution :)