D1212132333132233131323222313231323132313331322331311331313232211211   >>    D121213233313223313132322231323132313231333132233131133131323221121   <<    D1212132333132233131323222313231323132313331322331311331313232211213   >>      D1212132333132233131323222313231323132313331322331311331313232211212   >>