How many stories have a height less than 138 meters with a completion date in 1971?
CREATE TABLE "tallest_buildings" (
  "name" text,
  "location" text,
  "height_m" real,
  "stories" real,
  "year_of_completion" real
);
SELECT "stories" FROM "tallest_buildings" WHERE "height_m"<138 AND "year_of_completion"=1971;