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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.
one of the many pitfalls in only testing against predefined cases
Your solution is extremely clear and easy to follow. You helped me to remember the importance of taking a step back to focus on refactoring for clarity.
Well done and thank you!