What are the fewest points that Roger Dutton/Tony Wright have received?
CREATE TABLE "1972_isle_of_man_sidecar_500cc_tt_final_" (
  "place" real,
  "rider" text,
  "country" text,
  "machine" text,
  "speed" text,
  "time" text,
  "points" real
);
SELECT MIN("points") FROM "1972_isle_of_man_sidecar_500cc_tt_final_" WHERE "rider"='roger dutton/tony wright';