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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.
Theoretically this solution is wrong because
n
could be some weird root of thetotal_combinations
polynomial such that it computes to an integer. You rely on the numerical error to safe you from this.