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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.
I think I've fixed it now, thanks for the note
Fixed it. I used math in my correct solution, copied it over to the Test cases, but forgot to import math in the tests to make my code work without having math in the user solution.
Thanks for the catch!
This is just an idea, and may go against what you're going for with this beginner kata, but it could be a good idea to add some larger numbers in the tests to make performance a slight issue.