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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.
Sorry I don't have the requisite Ruby skills to help with this issue. Maybe GiacomoSorbi can have a look?
So to speak none is really essential but I added them just because it reflects the nature of arguments in the test cases.