D1212132333132233131323222313231323221323132322331311331313311221   >>    D121213233313223313132322231323132322132313232233131133131331122   <<    D1212132333132233131323222313231323221323132322331311331313311223   >>      D1212132333132233131323222313231323221323132322331311331313311222   >>