-er eee eef eem eeo eep eer ees eet ef- efe eff efm efo efp efr efs eft em- eme emf emm emo emp emr ems emt eo- eoe eof eom eoo eop eor eos eot ep- epe epf epm epo epp epr eps ept ere erf erm ero erp err ers ert es- ese esf esm eso esp esr ess est ete etf etm eto etp etr ets ett fee fef fem feo fep fer fes fet ffe fff ffm ffo ffp ffr ffs fft fme fmf fmm fmo fmp fmr fms fmt foe fof fom foo fop for fos fot fpe fpm fpo fpp fpr fps fpt fre frf frm fro frp frr frs frt fse fsf fsm fso fsp fsr fss fst fte ftf ftm fto ftp ftr fts ftt m-f m-o m-r mee mef mem meo mep mer mes met mfe mff mfm mfo mfp mfr mfs mft mme mmf mmm mmo mmp mmr mms mmt moe mof mom moo mop mor mos mot mpe mpf mpm mpo mpp mpr mps mpt mre mrf mrm mro mrp mrr mrs mrt mse msf msm mso msp msr mss mst mte mtf mtm mto mtp mtr mts mtt oee oef oem oeo oep oer oes oet of- ofe off ofm ofo ofp ofr ofs oft om- ome omf omm omo omp omr oms omt oo- oof oom ooo oop oor oos oot op- ope opf opm opo opp opr ops opt or- ore orf orm oro orp orr ors ort os- ose osf osm oso osp osr oss ost ot- ote otf otm oto otp otr ots ott p-p pee pef pem peo pep per pes pet pfe pff pfm pfo pfp pfr pfs pft pme pmf pmm pmo pmp pmr pms pmt poe pof pom poo pop por pos pot ppe ppf ppm ppo ppp ppr pps ppt pre prf prm pro prp prr prs prt ps- pse psf psm pso psp psr pss pst pt- pte ptf ptm pto ptp ptr pts ptt re- ree ref rem reo rep rer res ret rfe rff rfm rfo rfp rfr rfs rft rme rmf rmm rmo rmp rmr rms rmt roe rof rom roo rop ror ros rot rpe rpf rpm rpo rpp rpr rps rpt rrf rrm rrp rrr rrs rrt rse rsf rsm rso rsp rsr rss rst rte rtf rtm rto rtp rtr rts rtt se- see sef sem seo sep ser ses set sfe sff sfm sfo sfp sfr sfs sft sme smf smm smo smp smr sms smt soe sof som soo sop sor sos sot spe spf spm spo spp spr sps spt sr- sre srf srm sro srp srr srs srt ss- sse ssf ssm sso ssp ssr sss sst ste stf stm sto stp str sts stt te- tee tef tem teo tep ter tes tet tfe tff tfm tfo tfp tfr tfs tft tme tmf tmm tmo tmp tmr tms tmt to- toe tof tom too top tor tos tot tpe tpf tpm tpo tpp tpr tps tpt tre trf trm tro trp trr trs trt tse tsf tsm tso tsp tsr tss tst tte ttf ttm tto ttp ttr tts ttt