What was the title of the episode written by Mark Goffman?
CREATE TABLE "table1_23255941_1" (
  "episode_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "viewers_in_millions" text
);
SELECT "title" FROM "table1_23255941_1" WHERE "written_by"='Mark Goffman';