CSC153, Class 41: Polymorphism Example, Continued

Overview:
* Review of the Prereq interface
* Building PrereqOr
* Building PrereqAnd
* Building PrereqCourse

Notes:
* Questions on exam 3?

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Review: 
* What goes in a prerequisite?
* What is a PrereqOr?
* What can we build PrereqOrs from?

Because our computer system was having trouble, there is no body to
the EBoard for today's class.