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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.
Personaly I think this should be a complaint with the question, because it is implied that they will be positive, but the type signature/constraints don't explicitly say so.