CREATE TABLE table_38474 ("School Year" TEXT, "Class A" TEXT, "Class AA" TEXT, "Class AAA" TEXT, "Class AAAA" TEXT, "Class AAAAA" TEXT)

What is the Class AA with a Class AAAA of Sulphur Springs and Duncanville as the class AAAAA?
SELECT "Class AA" FROM table_38474 WHERE "Class AAAA" = 'sulphur springs' AND "Class AAAAA" = 'duncanville'
SELECT "Class AA" FROM "table_38474" WHERE "Class AAAA" = 'sulphur springs' AND "Class AAAAA" = 'duncanville'