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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.
That way all the numbers are stored in memory and don't have to be (re)computed for every function call.
Why do you calculate the numbers outer the main function
nice Way to do this :)