D1212121212131323223313233231323132313331323331311331323221123231   >>    D121212121213132322331323323132313231333132333131133132322112323   <<    D1212121212131323223313233231323132313331323331311331323221123233   >>      D1212121212131323223313233231323132313331323331311331323221123232   >>