ddd dde ddo ddp dds ddt de- ded dee deo dep des det dod doe doo dop dos dot dpd dpe dpo dpp dps dpt dsd dse dso dsp dss dst dtd dte dto dtp dts dtt ed- edd ede edo edp eds edt eed eee eeo eep ees eet eo- eod eoe eoo eop eos eot ep- epd epe epo epp eps ept es- esd ese eso esp ess est etd ete eto etp ets ett odd ode odo odp ods odt oed oee oeo oep oes oet oo- ood ooo oop oos oot op- opd ope opo opp ops opt os- osd ose oso osp oss ost ot- otd ote oto otp ots ott p-p pdd pde pdo pdp pds pdt ped pee peo pep pes pet pod poe poo pop pos pot ppd ppe ppo ppp pps ppt ps- psd pse pso psp pss pst pt- ptd pte pto ptp pts ptt sdd sde sdo sdp sds sdt se- sed see seo sep ses set sod soe soo sop sos sot spd spe spo spp sps spt ss- ssd sse sso ssp sss sst std ste sto stp sts stt tdd tde tdo tdp tds tdt te- ted tee teo tep tes tet to- tod toe too top tos tot tpd tpe tpo tpp tps tpt tsd tse tso tsp tss tst ttd tte tto ttp tts ttt