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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 makes my head hurt. Do you really need a product function?
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This is an interesting topic, but the explanation is unecessarily confusing. There are much simpler explanations of the three steps, but I would probably recommend this be a 4kyu kata.