D12121323331313331312313231323223313232211233132321123232223221   >>    D1212132333131333131231323132322331323221123313232112323222322   <<    D12121323331313331312313231323223313232211233132321123232223223   >>      D12121323331313331312313231323223313232211233132321123232223222   >>