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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.
Clever approach!
To those still stumped by this Kata, the best advice I and anyone could give is to debug your code and make sure all test cases work with your solution.
Python 3.9 should be enabled.
Was about to raise an issue because of that, thanks for the clarification!