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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 are some issues with the validation code. After getting the code rejected a couple of times it finally accepted it. I don't know if that's because my code is broken and I somehow managed to sneak around the problem in the generated test cases or if there's a problem with the test code itself