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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.
really
Random tests are ok, your code is wrong. It is true the tests are lacking some cases that should be fixed tests and that allowed your incorrect code to pass, but it was already reported so I'll close this one.
Your code fails with these values for instance: a = 2, b = 2 and c = 4.