What is the lowest Pioneer population with a Sarina population less than 7,537 and a Mirani population less than 5,379 in 1966?
CREATE TABLE "population" (
  "year" real,
  "total_region" real,
  "mackay" real,
  "pioneer" real,
  "mirani" real,
  "sarina" real
);
SELECT MIN("pioneer") FROM "population" WHERE "sarina"<'7,537' AND "year"=1966 AND "mirani"<'5,379';