What team has a porsche 956 b chassis-engine with less than 79 laps?
CREATE TABLE "official_results" (
  "class" text,
  "team" text,
  "driver" text,
  "chassis_engine" text,
  "laps" real
);
SELECT "team" FROM "official_results" WHERE "chassis_engine"='porsche 956 b' AND "laps"<79;