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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 think there may be a problem with the submit test case in Ruby. It's working perfectly in my terminal, and even works when I change the kata test case to the second submit test case and run it, but when I press submit it doesn't pass that same test case.