When the nominee(s) is john wells what is the episode for a year before 2004?
CREATE TABLE "humanitas_prize" (
  "year" real,
  "category" text,
  "nominee_s" text,
  "episode" text,
  "result" text
);
SELECT "episode" FROM "humanitas_prize" WHERE "year"<2004 AND "nominee_s"='john wells';