ddd ddn ddo ddp dds dnd dnn dno dnp dns dod don doo dop dos dpd dpn dpo dpp dps dsd dsn dso dsp dss ndd ndn ndo ndp nds nnn nno nnp nns no- nod non noo nop nos npd npn npo npp nps nsd nsn nso nsp nss odd odn odo odp ods on- ond onn ono onp ons oo- ood oon ooo oop oos op- opd opn opo opp ops os- osd osn oso osp oss p-p pdd pdn pdo pdp pds pn- pnd pnn pno pnp pns pod pon poo pop pos ppd ppn ppo ppp pps ps- psd psn pso psp pss sdd sdn sdo sdp sds snd snn sno snp sns sod son soo sop sos spd spn spo spp sps ss- ssd ssn sso ssp sss