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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.
I found an issue with the java test cases as well. The instructions direct one to return false on zero or negative radius, but the default test cases expect an IllegalAgumentException to be thrown.