CREATE TABLE "table1_27116696_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);

Question: Who wrote the episode with the production code of 3t7255?
SQL: SELECT "written_by" FROM "table1_27116696_1" WHERE "production_code"='3T7255';

Question: How many U.S. viewers (million) watched the episode directed by Allison Liddi-Brown?
SQL: SELECT "u_s_viewers_million" FROM "table1_27116696_1" WHERE "directed_by"='Allison Liddi-Brown';

Question: What is the total number of production code listings of episodes written by Matthew Lau?
SQL: SELECT COUNT("production_code") FROM "table1_27116696_1" WHERE "written_by"='Matthew Lau';