What is the largest number of cars per set that is less than 9?
CREATE TABLE "class_253_and_254" (
  "class" text,
  "operator" text,
  "number" real,
  "year_built" text,
  "cars_per_set" real,
  "unit_numbers" text
);
SELECT MAX("number") FROM "class_253_and_254" WHERE "cars_per_set"<9;