How many production codes are there for episode 10 in the season?
CREATE TABLE "table1_24425976_2" (
  "series" real,
  "season" text,
  "original_air_date" text,
  "production_code" text,
  "episode_title" text
);
SELECT COUNT("production_code") FROM "table1_24425976_2" WHERE "season"='10';