eee eem eeo eep eet eex em- eme emm emo emp emt emx eo- eoe eom eoo eop eot ep- epe epm epo epp ept epx ete etm eto etp ett etx ex- exe exo exp ext exx m-o mee mem meo mep met mex mme mmm mmo mmp mmt mmx moe mom moo mop mot mox mpe mpm mpo mpp mpt mpx mte mtm mto mtp mtt mtx mxp oee oem oeo oep oet oex om- ome omm omo omp omt omx oo- oom ooo oop oot oox op- ope opm opo opp opt opx ot- ote otm oto otp ott ox- oxo oxt oxx p-p pee pem peo pep pet pex pme pmm pmo pmp pmt pmx poe pom poo pop pot pox ppe ppm ppo ppp ppt ppx pt- pte ptm pto ptp ptt ptx pxe pxm pxt t-x te- tee tem teo tep tet tex tme tmm tmo tmp tmt tmx to- toe tom too top tot tox tpe tpm tpo tpp tpt tpx tte ttm tto ttp ttt ttx txe txt xee xem xep xet xex xmm xmo xmp xmt xmx xom xoo xop xot xox xpe xpm xpo xpp xpt xtm xtp xtx xxo xxp xxx