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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.
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Question, I am getting a test case looking for an answer of 15, but that is a 2 digit number. I believe the answer should be 6. I'm not seeing any special cases I should be looking for when encountering 15 in the instructions.