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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'm embarrassed that I didn't know the method 'digits' existed.
I like this too, but I didn't know you could change the method signature, but your way of doing so was elegant. It effectively side-steps the whole issue.