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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.
How does this even work? In MRI I get an error about @@subclasses not being initialized. For this to work, it should be a class-level instance variable (@subclasses) rather than a class variable.
This is what I did, except yours is a little bit more elegant. Awesome!