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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.
It's very lengthy but i think thats intentional to explain the steps of breaking this down, realistically he coulda used Reg-Ex and Higher Order Methods to refactor this but I think its just to see how to go abt the problem itself.