eee eef eek eeo eep ees eet ef- efe eff efo efp efs eft eke ekf eko ekp eks ekt eo- eoe eof eok eoo eop eos eot ep- epe epf epo epp eps ept es- ese esf esk eso esp ess est ete etf etk eto etp ets ett fee fef fek feo fep fes fet ffe fff ffk ffo ffp ffs fft fkf fkk fkp fkt foe fof fok foo fop fos fot fpe fpk fpo fpp fps fpt fse fsf fsk fso fsp fss fst fte ftf ftk fto ftp fts ftt k-t ke- kee kef kek keo kep kes ket kff kfo kfs kke kkk kkp kks kkt koe kof kok koo kop kos kot kpe kpf kpk kpo kpp kps kpt kse ksf ksk kso ksp kss kst kte ktf ktk kto ktp kts ktt oee oef oeo oep oes oet of- ofe off ofo ofp ofs oft oke okk oko okp oks oo- oof ook ooo oop oos oot op- ope opf opk opo opp ops opt os- ose osf osk oso osp oss ost ot- ote otf otk oto otp ots ott p-p pee pef pek peo pep pes pet pfe pff pfk pfo pfp pfs pft pke pkf pko pkp pks pkt poe pof pok poo pop pos pot ppe ppf ppk ppo ppp pps ppt ps- pse psf psk pso psp pss pst pt- pte ptf ptk pto ptp pts ptt se- see sef sek seo sep ses set sfe sff sfk sfo sfp sfs sft sk- ske skf skk sko skp sks skt soe sof sok soo sop sos sot spe spf spk spo spp sps spt ss- sse ssf ssk sso ssp sss sst ste stf stk sto stp sts stt te- tee tef tek teo tep tes tet tfe tff tfk tfo tfp tfs tft tke tkk tko tkp tks tkt to- toe tof tok too top tos tot tpe tpf tpk tpo tpp tps tpt tse tsf tsk tso tsp tss tst tte ttf ttk tto ttp tts ttt