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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.
Oh, wow, this is one of those moments where I solve it and get to here and then realize I overcomplicated the solution to the max, but what is different here, and the reason I'm commenting on it, is it's not like your solution, the top solution, was one of the one liners where someone chains a bunch of obscure methods together, and if I'm being honest, I get a bit discouraged. But your solution is simple and I think I feel even worse than normal because of it.
Thank you, though, for your elegant solution.