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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 wrote the explanation keeping in mind a recursive solution is being attempted.
Nevertheless, I've worded it slightly differently, but I don't know whether it is sufficient.