Table: episode_info_2
Columns: no_in_series
no_in_season
title
directed_by
written_by
storyboarded_by
original_air_date
production_code

Question: What's the production code of the episode with a series number 37b? 
SQL: SELECT "production_code" FROM episode_info_2 WHERE "no_in_series" = '37b'

Question: On what date did the episode with a series number 31, with a story written by William Reiss, air for the first time? 
SQL: SELECT "original_air_date" FROM episode_info_2 WHERE "storyboarded_by" = 'William Reiss' AND "no_in_series" = '31'

Question: When did the episode with season number 10b air for the first time? 
SQL: SELECT "original_air_date" FROM episode_info_2 WHERE "no_in_season" = '10b'

Question: When did the episode with series number 29a originally air? 
SQL: SELECT "original_air_date" FROM episode_info_2 WHERE "no_in_series" = '29a'

Question: How many episodes have been directed and written by Darrick Bachman and Brett Varon? 
SQL: SELECT COUNT("directed_by") FROM episode_info_2 WHERE "written_by" = 'Darrick Bachman and Brett Varon'