What chassis has patrick racing as an entrant, with a start greater than 6?
CREATE TABLE "indianapolis_500" (
  "year" real,
  "chassis" text,
  "engine" text,
  "start" real,
  "finish" real,
  "entrant" text
);
SELECT "chassis" FROM "indianapolis_500" WHERE "entrant"='patrick racing' AND "start">6;