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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.
Very true! I have never ran into generators before, and I have been stuck on that part of the problem for a very long time. I agree that this should be bumped to a harder difficulty kyu.