with 6 rounds, and a 52 51/52 chassis, who is the driver?
CREATE TABLE "teams_and_drivers" (
  "entrant" text,
  "constructor" text,
  "chassis" text,
  "engine" text,
  "driver" text,
  "rounds" text
);
SELECT "driver" FROM "teams_and_drivers" WHERE "rounds"='6' AND "chassis"='52 51/52';