D1212121212131323223313233231323133313231323331311331313231333111   >>    D121212121213132322331323323132313331323132333131133131323133311   <<    D1212121212131323223313233231323133313231323331311331313231333113   >>      D1212121212131323223313233231323133313231323331311331313231333112   >>