Who is the away team for the tome team Leeds United, at the League Cup Competition?
CREATE TABLE "last_five_head_to_head_fixtures" (
  "date" text,
  "home_team" text,
  "score" text,
  "away_team" text,
  "venue" text,
  "competition" text
);
SELECT "away_team" FROM "last_five_head_to_head_fixtures" WHERE "home_team"='leeds united' AND "competition"='league cup';