What is the round 6+ that has single as round 2, double as round 4, from 1982?
CREATE TABLE "scoring_format" (
  "from" real,
  "goal" real,
  "round_1" text,
  "round_2" text,
  "round_3" text,
  "round_4" text,
  "round_5" text,
  "round_6" text
);
SELECT "round_6" FROM "scoring_format" WHERE "round_2"='single' AND "round_4"='double' AND "from"=1982;