In the earlier exercise about courses and projects (found in the lecture about abstract classes and interfaces) we refined the program about BooleanCourse, GradedCourse, and Project to use a common superclass called Course. Revise your solution (or the model solution) such that the courses in the class Project are represented as a variable of type List<Course> instead of by use of four variables of type Course.
Reimplement and simplify the method Passed in class Project. Take advantage of the new representation of the courses in a project, such that the "3 out of 4 rule" (see the original exercise) is implemented in a more natural way.