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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 submitted my soluton in Java and it works OK. I guess I have some serious issues with the use static methods. My solution would have been a lot cleaner and easier to test had this problem removed the static keyword modifier from the phone method.