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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.
Not a kata issue, it's a problem with your code, read again the instructions:
Mark your post as having spoiler content when you paste code like this. And read about how to use proper markdown