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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 agree with @alemontree that this should NOT be voted as best practice. Granted my solution is nearly identical. However I am aware that this solution is suboptimal. I wish I could understand how to write this with at least linear efficiency. I will learn in time! It's good to make people aware of this so they can optimize their code!