What's the latest original air date with more than 10 episodes and a DVD Region 2 release date of 23 april 2012?
CREATE TABLE "series" (
  "series_number" real,
  "number_of_episodes" real,
  "original_air_date" real,
  "dvd_region_2_release_date" text,
  "dvd_region_1_release_date" text
);
SELECT MAX("original_air_date") FROM "series" WHERE "dvd_region_2_release_date"='23 april 2012' AND "number_of_episodes">10;