What is the frequency for the 10kw station with DXEZ as its callsign?
CREATE TABLE "monster_radio_stations" (
  "branding" text,
  "callsign" text,
  "frequency" text,
  "power_k_w" text,
  "coverage" text
);
SELECT "frequency" FROM "monster_radio_stations" WHERE "power_k_w"='10kw' AND "callsign"='dxez';