A student must complete at least two math courses, at least two OR courses, and at least two computer courses to graduate with a major in operations research. Some courses can be used to fulfil more than one requirement: Calculus can fulfil the math requirement; operations research can fulfil math and OR requirements; data structures can fulfil computer and math requirements; business statistics can fulfil math and OR requirements; computer simulation can fulfil OR and computer requirements; introduction to computer programming can fulfil computer requirement; and forecasting can fulfil OR and math requirements. Some courses are prerequisites for others: Calculus is a prerequisite for business statistics; introduction to computer programming is a prerequisite for computer simulation and for data structures; and business statistics is a prerequisite for forecasting. Formulate an IP that minimizes the number of courses needed to satisfy the major requirements.