human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Episode #, Title, Air Date, Rating, Share, 18–49, Viewers, Rank
###Question: What is the average Episode # with a 7 share and 18–49 is less than 2 and the Air Date of may 21, 2009?
gpt
SELECT AVG Episode # FROM table WHERE Share = 7 AND 18–49 < 2 AND Air Date = may 21, 2009