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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.
They do, but then why write purposefully suboptimal code just because the rules of the problem allow it?
Mom I learned how to make a class today