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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 the other comments here, so I have no criticisms to add. Solutions like this make me want to delve even further into ruby. This answer is very elegant and makes me want to focus more on trying to create one line solutions.