Table: show_episodes_2
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_millions

Question: What is the production code for the movie with 4.32 million U.S. viewers?
SQL: SELECT "production_code" FROM show_episodes_2 WHERE "u_s_viewers_millions" = '4.32'