-er eee eef eem eeo eer ees eet ef- efe eff efm efo efr efs eft em- eme emf emm emo emr ems emt eo- eoe eof eom eoo eor eos eot ere erf erm ero err ers ert es- ese esf esm eso esr ess est ete etf etm eto etr ets ett fee fef fem feo fer fes fet ffe fff ffm ffo ffr ffs fft fme fmf fmm fmo fmr fms fmt foe fof fom foo for fos fot fre frf frm fro frr frs frt fse fsf fsm fso fsr fss fst fte ftf ftm fto ftr fts ftt m-f m-o m-r mee mef mem meo mer mes met mfe mff mfm mfo mfr mfs mft mme mmf mmm mmo mmr mms mmt moe mof mom moo mor mos mot mre mrf mrm mro mrr mrs mrt mse msf msm mso msr mss mst mte mtf mtm mto mtr mts mtt oee oef oem oeo oer oes oet of- ofe off ofm ofo ofr ofs oft om- ome omf omm omo omr oms omt oo- oof oom ooo oor oos oot or- ore orf orm oro orr ors ort os- ose osf osm oso osr oss ost ot- ote otf otm oto otr ots ott re- ree ref rem reo rer res ret rfe rff rfm rfo rfr rfs rft rme rmf rmm rmo rmr rms rmt roe rof rom roo ror ros rot rrf rrm rrr rrs rrt rse rsf rsm rso rsr rss rst rte rtf rtm rto rtr rts rtt se- see sef sem seo ser ses set sfe sff sfm sfo sfr sfs sft sme smf smm smo smr sms smt soe sof som soo sor sos sot sr- sre srf srm sro srr srs srt ss- sse ssf ssm sso ssr sss sst ste stf stm sto str sts stt te- tee tef tem teo ter tes tet tfe tff tfm tfo tfr tfs tft tme tmf tmm tmo tmr tms tmt to- toe tof tom too tor tos tot tre trf trm tro trr trs trt tse tsf tsm tso tsr tss tst tte ttf ttm tto ttr tts ttt