what is the number of the episode in series that is called "breaking up is easy to do (part 1)"?
CREATE TABLE "table1_2226817_12" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text
);
SELECT "no_in_series" FROM "table1_2226817_12" WHERE "title"='\"Breaking Up Is Easy to Do (Part 1)\"';