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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 really enjoyed this one. I love it when the naiive implementation is easy, but the performance aspect forces me to throw most of it away and re-think it.