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