Table: tv_episode_data_50
Columns: no_in_series
no_in_season
title
directed_by
written_by
u_s_viewers_million
original_air_date
production_code

Question: Who wrote episode number 48
SQL: SELECT "written_by" FROM tv_episode_data_50 WHERE "no_in_series" = 48

Question: What is the lowest production code
SQL: SELECT MIN("production_code") FROM tv_episode_data_50