ddd dde ddk ddo ddp dds ddt ddx de- ded dee dek deo dep des det dex dke dkk dko dkp dks dkt dkx dod doe dok doo dop dos dot dox dpd dpe dpk dpo dpp dps dpt dsd dse dsk dso dsp dss dst dsx dtd dte dtk dto dtp dts dtt dtx dxd dxo dxp dxs dxt dxx ed- edd ede edk edo edp eds edt edx eed eee eek eeo eep ees eet eex ekd eke eko ekp eks ekt eo- eod eoe eok eoo eop eos eot ep- epd epe epo epp eps ept epx es- esd ese esk eso esp ess est esx etd ete etk eto etp ets ett etx ex- exd exe exo exp exs ext exx k-t kde kdk kdo kdp kds kdt kdx ke- ked kee kek keo kep kes ket kex kke kkk kkp kks kkt kod koe kok koo kop kos kot kpd kpe kpk kpo kpp kps kpt ksd kse ksk kso ksp kss kst kte ktk kto ktp kts ktt kxo odd ode odo odp ods odt oed oee oeo oep oes oet oex okd oke okk oko okp oks oo- ood ook ooo oop oos oot oox op- opd ope opk opo opp ops opt opx os- osd ose osk oso osp oss ost osx ot- otd ote otk oto otp ots ott ox- oxo oxt oxx p-p pdd pde pdk pdo pdp pds pdt pdx ped pee pek peo pep pes pet pex pkd pke pko pkp pks pkt pod poe pok poo pop pos pot pox ppd ppe ppk ppo ppp pps ppt ppx ps- psd pse psk pso psp pss pst psx pt- ptd pte ptk pto ptp pts ptt ptx pxe pxk pxs pxt sdd sde sdk sdo sdp sds sdt se- sed see sek seo sep ses set sex sk- skd ske skk sko skp sks skt skx sod soe sok soo sop sos sot sox spd spe spk spo spp sps spt spx ss- ssd sse ssk sso ssp sss sst ssx std ste stk sto stp sts stt stx sxs sxt t-x tdd tde tdk tdo tdp tds tdt tdx te- ted tee tek teo tep tes tet tex tke tkk tko tkp tks tkt to- tod toe tok too top tos tot tox tpd tpe tpk tpo tpp tps tpt tpx tsd tse tsk tso tsp tss tst tsx ttd tte ttk tto ttp tts ttt ttx txe txk txs txt xde xdk xds xdt xed xee xep xes xet xex xke xks xod xok xoo xop xos xot xox xpd xpe xpo xpp xps xpt xsp xss xst xtp xts xtx xxo xxp xxx