Who was the away team on 31 January 1987 when the home team was Wimbledon?
CREATE TABLE "fourth_round_proper" (
  "tie_no" text,
  "home_team" text,
  "score" text,
  "away_team" text,
  "date" text
);
SELECT "away_team" FROM "fourth_round_proper" WHERE "date"='31 january 1987' AND "home_team"='wimbledon';