RealmSwift wants to get a list of "many" of one-to-many relationships

I'm a beginner practicing database operations at realm.
Implementation of tag functionality, database design
I was able to run the database using this answer.

Therefore, I would like to display a list of tags on TableView and so on, but I don't know how to get a list of tags attached to the notebook.

Could you tell me how to get a list of tags attached to the notebook?
Thank you for your cooperation.

environment

• Xcode 9.2
• Swift4
• realm-swift-3.1.1