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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.
I made this mistake as well- if you create a class you can't assume an instance of it will be set up. I used static functions as a quick fix.