UML State Machine Diagrams Draw a UML state machine diagram to represent the life of a course. There are four kinds of events: "enrollment begun, enrollment ended, student enrolled and student dropped. After enrollment has begun, the course is open for enrollment. Before the course is full, students are added to an enrolled list. After the course is full, students are added to a waiting list. If a student has dropped the course, he or she is removed from the enrolled list. If there is a student in the waiting list, the student will be moved from the waiting list to the enrolled list. After the enrollment period has ended, no student can add or drop the course