ddd ddg ddn ddo ddp dgd dgg dgn dgp dnd dng dnn dno dnp dod dog don doo dop dpd dpg dpn dpo dpp g-d g-p gdd gdn gdo gdp ggd ggg ggn ggo ggp gnd gnn gno gnp god gog gon goo gop gpd gpg gpn gpo gpp ndd ndg ndn ndo ndp ngd ngg ngn ngo ngp nng nnn nno nnp no- nod nog non noo nop npd npg npn npo npp odd odg odn odo odp ogd ogg ogn ogo ogp on- ond ong onn ono onp oo- ood oog oon ooo oop op- opd opg opn opo opp p-p pdd pdg pdn pdo pdp pgd pgg pgn pgo pgp pn- pnd png pnn pno pnp pod pog pon poo pop ppd ppg ppn ppo ppp