D1212121212131323223313233231323133313231323331311331323132232311   >>    D121212121213132322331323323132313331323132333131133132313223231   <<    D1212121212131323223313233231323133313231323331311331323132232313   >>      D1212121212131323223313233231323133313231323331311331323132232312   >>