In a college course website system if both the instructor and students can submit comments to a discussion thread, a use case diagram might model that with inheritance.

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Inheritance is a relationship between classes where one class (the child class) inherits the properties and methods of another class (the parent class). In this case, the instructor and student classes could both inherit from a common parent class called "User", which would define the properties and methods that are common to both instructors and students, such as the ability to submit comments to a discussion thread.

In a College Course Website System If Both the Instructor