CREATE TABLE "table1_19929970_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_millions" text
);

Question: Who directed the episode with production code 4akj08?
SQL: SELECT "directed_by" FROM "table1_19929970_1" WHERE "production_code"='4AKJ08';

Question: Who directed the episode with production code 4akj01?
SQL: SELECT "directed_by" FROM "table1_19929970_1" WHERE "production_code"='4AKJ01';