-er eee eem eeo eep eer ees eet em- eme emm emo emp emr ems emt eo- eoe eom eoo eop eor eos eot ep- epe epm epo epp epr eps ept ere erm ero erp err ers ert es- ese esm eso esp esr ess est ete etm eto etp etr ets ett m-o m-r mee mem meo mep mer mes met mme mmm mmo mmp mmr mms mmt moe mom moo mop mor mos mot mpe mpm mpo mpp mpr mps mpt mre mrm mro mrp mrr mrs mrt mse msm mso msp msr mss mst mte mtm mto mtp mtr mts mtt oee oem oeo oep oer oes oet om- ome omm omo omp omr oms omt oo- oom ooo oop oor oos oot op- ope opm opo opp opr ops opt or- ore orm oro orp orr ors ort os- ose osm oso osp osr oss ost ot- ote otm oto otp otr ots ott p-p pee pem peo pep per pes pet pme pmm pmo pmp pmr pms pmt poe pom poo pop por pos pot ppe ppm ppo ppp ppr pps ppt pre prm pro prp prr prs prt ps- pse psm pso psp psr pss pst pt- pte ptm pto ptp ptr pts ptt re- ree rem reo rep rer res ret rme rmm rmo rmp rmr rms rmt roe rom roo rop ror ros rot rpe rpm rpo rpp rpr rps rpt rrm rrp rrr rrs rrt rse rsm rso rsp rsr rss rst rte rtm rto rtp rtr rts rtt se- see sem seo sep ser ses set sme smm smo smp smr sms smt soe som soo sop sor sos sot spe spm spo spp spr sps spt sr- sre srm sro srp srr srs srt ss- sse ssm sso ssp ssr sss sst ste stm sto stp str sts stt te- tee tem teo tep ter tes tet tme tmm tmo tmp tmr tms tmt to- toe tom too top tor tos tot tpe tpm tpo tpp tpr tps tpt tre trm tro trp trr trs trt tse tsm tso tsp tsr tss tst tte ttm tto ttp ttr tts ttt