eee eef eem eeo eep eet ef- efe eff efm efo efp eft em- eme emf emm emo emp emt eo- eoe eof eom eoo eop eot ep- epe epf epm epo epp ept ete etf etm eto etp ett fee fef fem feo fep fet ffe fff ffm ffo ffp fft fme fmf fmm fmo fmp fmt foe fof fom foo fop fot fpe fpm fpo fpp fpt fte ftf ftm fto ftp ftt m-f m-o mee mef mem meo mep met mfe mff mfm mfo mfp mft mme mmf mmm mmo mmp mmt moe mof mom moo mop mot mpe mpf mpm mpo mpp mpt mte mtf mtm mto mtp mtt oee oef oem oeo oep oet of- ofe off ofm ofo ofp oft om- ome omf omm omo omp omt oo- oof oom ooo oop oot op- ope opf opm opo opp opt ot- ote otf otm oto otp ott p-p pee pef pem peo pep pet pfe pff pfm pfo pfp pft pme pmf pmm pmo pmp pmt poe pof pom poo pop pot ppe ppf ppm ppo ppp ppt pt- pte ptf ptm pto ptp ptt te- tee tef tem teo tep tet tfe tff tfm tfo tfp tft tme tmf tmm tmo tmp tmt to- toe tof tom too top tot tpe tpf tpm tpo tpp tpt tte ttf ttm tto ttp ttt