What unit has cars per set larger than 9 built in 1982?
CREATE TABLE "class_253_and_254" (
  "class" text,
  "operator" text,
  "number" real,
  "year_built" text,
  "cars_per_set" real,
  "unit_numbers" text
);
SELECT "unit_numbers" FROM "class_253_and_254" WHERE "cars_per_set">9 AND "year_built"='1982';