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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.
Partial goal of the solution is to use no modules
Added circle area function, where self.num is the radius of the circle
ah i see, thanks for the explanation