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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.
blue_pulled and red_pulled are always lower than the blue_start and red_start (as per problem definition).
What happens if all the red and blue have been pulled? IE: A denom of 0?