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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.
This must be the best one, it might not be a one-liner, but it is clever and readable. Even if you don't understand it at first glance, it's structure hints at its logic.