How many writers had an US air date of september 25, 1993?
CREATE TABLE "table1_10470082_3" (
  "no" real,
  "num" real,
  "title" text,
  "director" text,
  "writer" text,
  "us_air_date" text,
  "storyteller" text,
  "villains" text
);
SELECT COUNT("writer") FROM "table1_10470082_3" WHERE "us_air_date"='September 25, 1993';