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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.
Why use recursion here? First its useless overhead, second it forces unecessary comparison operations and its not easier to read in my oppinion. Recursion is mostly used to solve sub problems not repeat the same block of code a number of times.