show flights from san francisco to denver on either wednesday the twenty third or thursday the twenty fourth
O O O B-fromloc.city_name I-fromloc.city_name O B-toloc.city_name O O B-depart_date.day_name O B-depart_date.day_number I-depart_date.day_number B-or B-depart_date.day_name O B-depart_date.day_number I-depart_date.day_number