D12121212121313233313123231323223313132322331323132233132332211   >>    D1212121212131323331312323132322331313232233132313223313233221   <<    D12121212121313233313123231323223313132322331323132233132332213   >>      D12121212121313233313123231323223313132322331323132233132332212   >>