What is the Score of the match on May 21, 1984 with Outcome of runner-up?
CREATE TABLE "doubles_9_3_6" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "score" FROM "doubles_9_3_6" WHERE "outcome"='runner-up' AND "date"='may 21, 1984';