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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.
No offense but I think it's good enough for 6 kyu.
Too easy. It should be lower level.
No, they are inside the class so you can use them all you want. Being private just means they can't be accessed by instantiated objects.