Papa Murphy's coupon

It is super bowl time and time for PIZZA!  Papa Murphy's is giving us $5 off 2 family size regular priced pizza's.  The coupon states that it is limit 2, but is it limit 2 pizza's or limit of 4 pizza's (using the coupon twice on the deal)?!?  Either way...get your coupon HERE.  It expires on 2/28/10.