What is the high grid that has a Time/Retired of +6 laps, and under 69 laps?
CREATE TABLE "classification" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT MAX("grid") FROM "classification" WHERE "time_retired"='+6 laps' AND "laps"<69;