ddd ddn ddo ddp dds ddt dnd dnn dno dnp dns dnt dod don doo dop dos dot dpd dpn dpo dpp dps dpt dsd dsn dso dsp dss dst dtd dtn dto dtp dts dtt ndd ndn ndo ndp nds ndt nnn nno nnp nns nnt no- nod non noo nop nos not npd npn npo npp nps npt nsd nsn nso nsp nss nst ntd ntn nto ntp nts ntt odd odn odo odp ods odt on- ond onn ono onp ons ont oo- ood oon ooo oop oos oot op- opd opn opo opp ops opt os- osd osn oso osp oss ost ot- otd otn oto otp ots ott p-p pdd pdn pdo pdp pds pdt pn- pnd pnn pno pnp pns pnt pod pon poo pop pos pot ppd ppn ppo ppp pps ppt ps- psd psn pso psp pss pst pt- ptd ptn pto ptp pts ptt sdd sdn sdo sdp sds sdt snd snn sno snp sns snt sod son soo sop sos sot spd spn spo spp sps spt ss- ssd ssn sso ssp sss sst std stn sto stp sts stt tdd tdn tdo tdp tds tdt tnd tnn tno tnp tns tnt to- tod ton too top tos tot tpd tpn tpo tpp tps tpt tsd tsn tso tsp tss tst ttd ttn tto ttp tts ttt