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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.
My solution is months (possibly 12+) old. When I wrote it originally, I'm certain it conformed to the format. I suspect the instructions were changed in the meantime, but I have no way of verifying that.