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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.
actually, #digit and #sum are two different methods, chained together. one of the beautiful things about Ruby!
Took a bit of time to understand. Feels a bit magical that you can do it like this!
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