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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.
Is that the correct argument order? My understanding is the first argument is the "next" value in the array, and the second argument is the "current" or aggregate value. Am I misunderstanding your variable names or the order?