D1212121212131323331323231323132312323132322331311331323223313231312121   >>    D121212121213132333132323132313231232313232233131133132322331323131212   <<    D1212121212131323331323231323132312323132322331311331323223313231312123   >>      D1212121212131323331323231323132312323132322331311331323223313231312122   >>