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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.
At what point is it a programming challenge versus a math challenge? With a type of result like this it just seems like a problem your algebra teacher gave you, and not a great programming exercise.
This should be a kata 6 at least due to the complexity involved. Upset by how hard it was for a "7". Other than that a decent little exercise.