3-number of academic credits the course carries
S-offered every semester
Y-offered at least once every academic year
E-offered every other year, in academic years when the fall semester occurs in an even year (eg. 1990-1991)
O-offered every other year, in academic years when the fall semester occurs in an odd year (eg. 1991-1992)
SI-offered upon sufficient student interest
IR-offered irregularly
SS-offered only during the summer