eee eem eep ees eet eex em- eme emm emp ems emt emx ep- epe epm epp eps ept epx es- ese esm esp ess est esx ete etm etp ets ett etx ex- exe exp exs ext exx mee mem mep mes met mex mme mmm mmp mms mmt mmx mpe mpm mpp mps mpt mpx mse msm msp mss mst msx mte mtm mtp mts mtt mtx mxp mxs p-p pee pem pep pes pet pex pme pmm pmp pms pmt pmx ppe ppm ppp pps ppt ppx ps- pse psm psp pss pst psx pt- pte ptm ptp pts ptt ptx pxe pxm pxs pxt se- see sem sep ses set sex sme smm smp sms smt smx spe spm spp sps spt spx ss- sse ssm ssp sss sst ssx ste stm stp sts stt stx sxm sxs sxt t-x te- tee tem tep tes tet tex tme tmm tmp tms tmt tmx tpe tpm tpp tps tpt tpx tse tsm tsp tss tst tsx tte ttm ttp tts ttt ttx txe txs txt xee xem xep xes xet xex xmm xmp xms xmt xmx xpe xpm xpp xps xpt xsm xsp xss xst xtm xtp xts xtx xxp xxx