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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.
Can someone add the validation test cases to this one? Its hard to test when you dont have any valid numbers. I really enjoyed this one though. A fun way to practice linking methods!