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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.
Superb, clean solution! I didn't think to combine summing the digits into the key function directly.
As Oozaku mentions in her message below, the template is broken.
(provide greet)is missing. This is causing the error.