D12121212121313231311331323112331323132313232213331323331323133313232221221   >>    D1212121212131323131133132311233132313231323221333132333132313331323222122   <<    D12121212121313231311331323112331323132313232213331323331323133313232221223   >>      D12121212121313231311331323112331323132313232213331323331323133313232221222   >>