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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.
It's kind of the 'point' of this kata. You can do smaller problems iteratively, but you need a more robust and efficient solution for larger numbers. If you ever took integrals in school, think of how this problem would look like if it were written as an integral.