ddd ddm ddn ddo ddp dmd dmm dmn dmo dmp dnd dnm dnn dno dnp dod dom don doo dop dpd dpm dpn dpo dpp m-o mdd mdm mdn mdo mdp mmd mmm mmn mmo mmp mnm mnn mno mnp mod mom mon moo mop mpd mpm mpn mpo mpp ndd ndm ndn ndo ndp nmd nmm nmn nmo nmp nnm nnn nno nnp no- nod nom non noo nop npd npm npn npo npp odd odm odn odo odp om- omd omm omn omo omp on- ond onn ono onp oo- ood oom oon ooo oop op- opd opm opn opo opp p-p pdd pdm pdn pdo pdp pmd pmm pmn pmo pmp pn- pnd pnm pnn pno pnp pod pom pon poo pop ppd ppm ppn ppo ppp