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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.
My first instinct was to simply add a marker on every Node (mostly because it took 2 minutes to solve the problem), but this is a much more elegant solution. Isn't there a way to stop people from using class_eval?