Which leader born on December 17, 1874 started their term before 1984?
CREATE TABLE "history_of_leaders" (
  "name" text,
  "term_start" real,
  "term_end" text,
  "date_of_birth" text,
  "date_of_death" text
);
SELECT "name" FROM "history_of_leaders" WHERE "term_start"<1984 AND "date_of_birth"='december 17, 1874';