Assignment A1 (due Thursday 2/18/99): Implement a small rule-based system
in CLIPS to accomplish the following task: 
There are facts describing the required courses that must be taken by any
student in order to graduate. With each required course,
there is a specified minimum grade that must be achieved; students may have
to repeat a course if that minimum grade is not
achieved. With each course, there is a list of courses that are
prerequisites for that course. Also, with each course, there is
information available regarding whether the course is offered every Fall,
every Spring, or both. 

When a student interacts with your system, he is prompted for (and
supplies) his name, unique student id, and the list of courses
already taken, along with grades achieved in those courses. The output of
the system must be a list of courses that the student must
take in future semesters, generating a schedule that will minimize the
amount of time needed to graduate. Assume that no student
may register for more than 6 courses (ignoring credit hours).