D1212132333132233131323222313231323221323132322331311331323331311212121   >>    D121213233313223313132322231323132322132313232233131133132333131121212   <<    D1212132333132233131323222313231323221323132322331311331323331311212123   >>      D1212132333132233131323222313231323221323132322331311331323331311212122   >>