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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.
Tests are randomly generated. No idea what you are talking about. There is no need to seperate anything. If your code is faulty, then fix your code and not my kata.
Tests were created to test your solution and not to help you to write your code. All requirements are in the description of the kata.