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Now theres just one last thing we need to take care of in our data model, deletion rules. What are deletion rules? Well, let me ask you this, what happens to all the notes in a notebook when this notebook is deleted? And what happens to the notebook when a note inside it is deleted? These questions can be resolved setting deletion rules. Lets start with the Notes property. The deletion rules are over here, and we have several options. No Action, which is usually not something that you want to use, Nullify, Cascade, and Deny. Deny is also something that you usually dont use. So, our common options are Nullify and Cascade. When we delete a notebook, what should we do to the notes? They should be deleted also. Thats what cascade means. When notebook is deleted, all the linked notes will go away. So this should be Cascade. And we need to do the same thing for the inverse relationship. What happens to the notebook when one note is deleted? Should we delete the notebook? Obviously not. W