Examine the methods by which rights and duties of promissory and quasi-promissory origin are created, transferred, limited, discharged, breached, and enforced. For each semester hour of credit earned, the equivalent of one lecture hour a week for one semester. Law 221, 321, 421, 521, 621 and Law 280H, 380H, 480H, 580H, 680H may not both be counted.