Which second team had a first leg score of 83-69?
CREATE TABLE "second_preliminary_round" (
  "team_num1" text,
  "agg" text,
  "team_num2" text,
  "1st_leg" text,
  "2nd_leg" text
);
SELECT "team_num2" FROM "second_preliminary_round" WHERE "1st_leg"='83-69';