CREATE TABLE table_43454 ("School Year" TEXT, "Class A" TEXT, "Class AA" TEXT, "Class AAA" TEXT, "Class AAAA" TEXT, "Class AAAAA" TEXT)

What School Year has a Class AAAA of Dickinson?
SELECT "School Year" FROM table_43454 WHERE "Class AAAA" = 'dickinson'
SELECT "School Year" FROM "table_43454" WHERE "Class AAAA" = 'dickinson'