ddd ddn ddp dds ddt dnd dnn dnp dns dnt dpd dpn dpp dps dpt dsd dsn dsp dss dst dtd dtn dtp dts dtt ndd ndn ndp nds ndt nnn nnp nns nnt npd npn npp nps npt nsd nsn nsp nss nst ntd ntn ntp nts ntt p-p pdd pdn pdp pds pdt pn- pnd pnn pnp pns pnt ppd ppn ppp pps ppt ps- psd psn psp pss pst pt- ptd ptn ptp pts ptt sdd sdn sdp sds sdt snd snn snp sns snt spd spn spp sps spt ss- ssd ssn ssp sss sst std stn stp sts stt tdd tdn tdp tds tdt tnd tnn tnp tns tnt tpd tpn tpp tps tpt tsd tsn tsp tss tst ttd ttn ttp tts ttt