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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 compared the execution with my solution and both produced same result. Mine is a lot compact & implies recursion.
Performance/readability is not always the only concern especially in recreational programming sites like these - sometimes we like to come up with convoluted, inefficient solutions just for fun ;)