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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 had some errors on the random tests and I still got it through by brute forcing it, and doing it a bunch of times. That should probably be fixed.