what is the name of the episode whose number of the series episode was 31?
CREATE TABLE table_228973_3 (title VARCHAR, no_in_series VARCHAR)
SELECT title FROM table_228973_3 WHERE no_in_series = 31
### Context: CREATE TABLE table_228973_3 (title VARCHAR, no_in_series VARCHAR) ### Question: what is the name of the episode whose number of the series episode was 31? ### Answer: SELECT title FROM table_228973_3 WHERE no_in_series = 31