D1212121212131323223313233231323331313232233132323132313233313111311   >>    D121212121213132322331323323132333131323223313232313231323331311131   <<    D1212121212131323223313233231323331313232233132323132313233313111313   >>      D1212121212131323223313233231323331313232233132323132313233313111312   >>