eee eem eeo eep ees eet em- eme emm emo emp ems emt eo- eoe eom eoo eop eos eot ep- epe epm epo epp eps ept es- ese esm eso esp ess est ete etm eto etp ets ett m-o mee mem meo mep mes met mme mmm mmo mmp mms mmt moe mom moo mop mos mot mpe mpm mpo mpp mps mpt mse msm mso msp mss mst mte mtm mto mtp mts mtt oee oem oeo oep oes oet om- ome omm omo omp oms omt oo- oom ooo oop oos oot op- ope opm opo opp ops opt os- ose osm oso osp oss ost ot- ote otm oto otp ots ott p-p pee pem peo pep pes pet pme pmm pmo pmp pms pmt poe pom poo pop pos pot ppe ppm ppo ppp pps ppt ps- pse psm pso psp pss pst pt- pte ptm pto ptp pts ptt se- see sem seo sep ses set sme smm smo smp sms smt soe som soo sop sos sot spe spm spo spp sps spt ss- sse ssm sso ssp sss sst ste stm sto stp sts stt te- tee tem teo tep tes tet tme tmm tmo tmp tms tmt to- toe tom too top tos tot tpe tpm tpo tpp tps tpt tse tsm tso tsp tss tst tte ttm tto ttp tts ttt