Draw a set of UML models (use case diagram, and class diagram) for an online telephone directory to replace the phonebook that is provided to you by...

Draw a set of UML models (use case diagram, and class diagram) for an online telephone directory to replace the phonebook that is provided to you by your phone company. The directory should be able to provide phone numbers when presented with a name; it should also list area codes for different parts of the country and generate emergency telephone numbers for your area.