In the 6th round match with home team Bahia, who was the away team?
CREATE TABLE "second_three_matches" (
  "round" text,
  "date" text,
  "home_team" text,
  "score" text,
  "away_team" text
);
SELECT "away_team" FROM "second_three_matches" WHERE "round"='6th' AND "home_team"='bahia';