D1212121212131323223313233231323132313331323331311331313232111311   >>    D121212121213132322331323323132313231333132333131133131323211131   <<    D1212121212131323223313233231323132313331323331311331313232111313   >>      D1212121212131323223313233231323132313331323331311331313232111312   >>