D1212121212131323223313233231323331313232233132323132313311232311   >>    D121212121213132322331323323132333131323223313232313231331123231   <<    D1212121212131323223313233231323331313232233132323132313311232313   >>      D1212121212131323223313233231323331313232233132323132313311232312   >>