eee eem eep eet eex eie eii eim eip eit eix em- eme emi emm emp emt emx ep- epe epi epm epp ept epx ete eti etm etp ett etx ex- exe exi exp ext exx ie- iee iei iem iep iet iex iie iii iim iip iit iix im- ime imi imm imp imt imx ipe ipi ipm ipp ipt ipx ite iti itm itp itt itx ixe ixi mee mei mem mep met mex mi- mie mii mim mip mit mix mme mmi mmm mmp mmt mmx mpe mpi mpm mpp mpt mpx mte mti mtm mtp mtt mtx mxi mxp p-p pee pei pem pep pet pex pie pii pim pip pit pix pme pmi pmm pmp pmt pmx ppe ppi ppm ppp ppt ppx pt- pte pti ptm ptp ptt ptx pxe pxm pxt t-x te- tee tei tem tep tet tex tie tii tim tip tit tix tme tmi tmm tmp tmt tmx tpe tpi tpm tpp tpt tpx tte tti ttm ttp ttt ttx txe txi txt xee xem xep xet xex xie xii xit xix xmi xmm xmp xmt xmx xpe xpm xpp xpt xti xtm xtp xtx xxi xxp xxx