Table:
text: Avatar: The Last Airbender (season 2)
DVD releases
DVD releases
Volume Discs Episodes Region_1_release Region_2_release Region_4_release
1 1 5 January 23, 2007 Not released June 4, 2009
2 1 5 April 10, 2007 Not released August 6, 2009
3 1 5 May 22, 2007 Not released October 29, 2009
4 1 5 August 14, 2007 Not released March 31, 2010
Box set 4 20 September 11, 2007 July 20, 2009 September 9, 2010

Question: What is the Region 4 release that has July 20, 2009 as Region 2 for Avatar: The Last Airbender (Season 2)?

Question: What is the Region 1 release of Avatar: The Last Airbender (Season 2) that has July 20, 2009 as Region 2?

Question: What is the average episode of Avatar: The Last Airbender (season 2) that has September 11, 2007 as region 1?