D1212121212131323331323231323132312323132322331311331323223313231111121   >>    D121212121213132333132323132313231232313232233131133132322331323111112   <<    D1212121212131323331323231323132312323132322331311331323223313231111123   >>      D1212121212131323331323231323132312323132322331311331323223313231111122   >>