D1212121212131323331312323132322331313232233132313223313112123221   >>    D121212121213132333131232313232233131323223313231322331311212322   <<    D1212121212131323331312323132322331313232233132313223313112123223   >>      D1212121212131323331312323132322331313232233132313223313112123222   >>