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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.
clean and functional.
spend time looking at the other solutions and use the Array and Enumerable methods that are available.
many people find until and unless to be unintuitive, and therefore use while and if instead.