Table schema:
CREATE TABLE table_name_12 (class VARCHAR, frequency_mhz VARCHAR, city_of_license VARCHAR)

Question: Which Class has a Frequency MHz larger than 91.5, and a City of license of hyannis, nebraska?
SQL: SELECT class FROM table_name_12 WHERE frequency_mhz > 91.5 AND city_of_license = "hyannis, nebraska"