D1212121212131323223313233231323331313232233132323132313233313112131   >>    D121212121213132322331323323132333131323223313232313231323331311213   <<    D1212121212131323223313233231323331313232233132323132313233313112133   >>      D1212121212131323223313233231323331313232233132323132313233313112132   >>