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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'd suggest don't use filter because of that, you can't control how many numbers will be filtered, bah, you can but using another variable to keep tracking of that and that would be more complex than using another code.