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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.
you can alter the method's n parameter to get it to work. I looked up how to check if there is no argument passed in a function and you can use the keyword "None" to check if arguments were passed. Hope that helps without giving too much of an answer away.