Who was the opponent when the result was ud 12/12 and date was 1993-05-22?
CREATE TABLE "list_of_boxing_quadruple_or_four_divisio" (
  "number" real,
  "name" text,
  "titles" text,
  "date" text,
  "opponent" text,
  "result" text,
  "defenses" real
);
SELECT "opponent" FROM "list_of_boxing_quadruple_or_four_divisio" WHERE "result"='UD 12/12' AND "date"='1993-05-22';