CAN ANYONE HELP ME?

What's a good example of a diagram for both 12 and 13?

12.How can sequence diagrams enrich class diagrams? What are the potential problems with doing so?

13.Demonstrate with an example how an object in a sequence diagram maps to a class in a class diagram.

14.Demonstrate with an example how a message in a sequence diagram maps to a method (operation) in a class diagram.

Thank you!