D1212121212131323331312323132322331313232233132313223313331323131323123231311   >>    D121212121213132333131232313232233131323223313231322331333132313132312323131   <<    D1212121212131323331312323132322331313232233132313223313331323131323123231313   >>      D1212121212131323331312323132322331313232233132313223313331323131323123231312   >>