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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 was thinking about this one in the back of my head for the last day wondering how I'd ever do it. Then it suddenly just hit me when I was walking up the stairs and I coded this out in about 10m. Good job on this problem.