What is the 1980 value with a 1r in 1984 and a 1r in 1981?
CREATE TABLE "grand_slam_singles_tournament_timeline" (
  "tournament" text,
  "1980" text,
  "1981" text,
  "1982" text,
  "1983" text,
  "1984" text,
  "1985" text,
  "1986" text,
  "1987" text,
  "career_sr" text
);
SELECT "1980" FROM "grand_slam_singles_tournament_timeline" WHERE "1984"='1r' AND "1981"='1r';