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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 also ended up importing just the needed method rather than the entire module. But I still don't understand why the tests pass when importing the entire module but then the first test throws a NameError when running submit. It seems like an error in the Kata unit tests but I'm not experienced enough in Python to know for sure. Kind of frustrating if the unit tests have a deleterious effect on the code under test.