-er eee eef eem eeo eep eer eet ef- efe eff efm efo efp efr eft em- eme emf emm emo emp emr emt eo- eoe eof eom eoo eop eor eot ep- epe epf epm epo epp epr ept ere erf erm ero erp err ert ete etf etm eto etp etr ett fee fef fem feo fep fer fet ffe fff ffm ffo ffp ffr fft fme fmf fmm fmo fmp fmr fmt foe fof fom foo fop for fot fpe fpm fpo fpp fpr fpt fre frf frm fro frp frr frt fte ftf ftm fto ftp ftr ftt m-f m-o m-r mee mef mem meo mep mer met mfe mff mfm mfo mfp mfr mft mme mmf mmm mmo mmp mmr mmt moe mof mom moo mop mor mot mpe mpf mpm mpo mpp mpr mpt mre mrf mrm mro mrp mrr mrt mte mtf mtm mto mtp mtr mtt oee oef oem oeo oep oer oet of- ofe off ofm ofo ofp ofr oft om- ome omf omm omo omp omr omt oo- oof oom ooo oop oor oot op- ope opf opm opo opp opr opt or- ore orf orm oro orp orr ort ot- ote otf otm oto otp otr ott p-p pee pef pem peo pep per pet pfe pff pfm pfo pfp pfr pft pme pmf pmm pmo pmp pmr pmt poe pof pom poo pop por pot ppe ppf ppm ppo ppp ppr ppt pre prf prm pro prp prr prt pt- pte ptf ptm pto ptp ptr ptt re- ree ref rem reo rep rer ret rfe rff rfm rfo rfp rfr rft rme rmf rmm rmo rmp rmr rmt roe rof rom roo rop ror rot rpe rpf rpm rpo rpp rpr rpt rrf rrm rrp rrr rrt rte rtf rtm rto rtp rtr rtt te- tee tef tem teo tep ter tet tfe tff tfm tfo tfp tfr tft tme tmf tmm tmo tmp tmr tmt to- toe tof tom too top tor tot tpe tpf tpm tpo tpp tpr tpt tre trf trm tro trp trr trt tte ttf ttm tto ttp ttr ttt