What class is assigned to frequencies lower than 90.5?
CREATE TABLE "kansas" (
  "call_sign" text,
  "frequency_m_hz" real,
  "city_of_license" text,
  "erp_w" real,
  "class" text,
  "fcc_info" text
);
SELECT "class" FROM "kansas" WHERE "frequency_m_hz"<90.5;