D12121212121313233313123231323223313132322331323132233133313231221   >>    D1212121212131323331312323132322331313232233132313223313331323122   <<    D12121212121313233313123231323223313132322331323132233133313231223   >>      D12121212121313233313123231323223313132322331323132233133313231222   >>