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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.
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Ruby 2.5 appeared on Codewars relatively recently, while the kata is old.
It's not smart and I wrote this during my "solve every problem as fast as possible without using a brain cell" streak, don't bump this in production.