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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.
Thanks for the suggestion, I'll keep that in mind when authoring future Kata. The current efficient implementation is a direct translation of my JavaScript solution to the original Kata which did not take formalization considerations into account.