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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.
The fact that objects have no attributs does not mean that they do not differ in any way form each other. They are different nodes, and you can easily check if they are the same, or different node.
The fact that nodes have no readable property does not make the kata broken.