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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.
This was literally my first thought and after reading the cryptic manpage for diff() I thought: Nah, this will never work... And yet, here we are. Well done.