CREATE TABLE table_36339 ("Volume" TEXT, "Discs" FLOAT, "Episodes" FLOAT, "Region 1 release" TEXT, "Region 2 release" TEXT, "Region 4 release" TEXT)

What is the region 1 release that has july 20, 2009 as the region 2?
SELECT "Region 1 release" FROM table_36339 WHERE "Region 2 release" = 'july 20, 2009'
SELECT "Region 1 release" FROM "table_36339" WHERE "Region 2 release" = 'july 20, 2009'