Create a UML Sequence Diagram based on this normal flow of events.

Relationships: Staff Member Actor, includerelationship to the log in into the Courses and Classes Records use case

Normal Flow of Events:

1. The staff member enters the course whose classes are to be maintained.

2. The system responds with a list of all classes (either online or face-to-face) for the entered course.

3. The staff member then selects one of the classes and commands the system to perform one of the following operations on the selected class:

a) Delete the selected class.

b) Modify certain fields in the selected class.

4. Alternatively, the staff member actor can create a new class offering for the course, classify it as an online or face-to-face class, and then enter the required information for all kinds of classes and for each classification as follows:

a) For all classes:

i. Class begin date and class end date

b) For online classes:

i. Class URL

ii. Class browser

c) For face-to-face classes:

i. Class building

ii. Class room