eee eef eel eem eep eex ef- efe eff efi efl efm efp efx eie eif eii eil eim eip eix ele elf eli ell elm elp elx em- eme emf emi eml emm emp emx ep- epe epf epi epl epm epp epx ex- exe exi exl exp exx fee fef fei fel fem fep fex ffe fff ffi ffl ffm ffp ffx fie fif fii fil fim fip fix fle flf fli fll flm flp flx fme fmf fmi fml fmm fmp fmx fpe fpi fpl fpm fpp fpx fxe fxi fxm fxp fxx i-f ie- iee ief iei iel iem iep iex ife iff ifi ifl ifm ifp ifx iie iif iii iil iim iip iix il- ile ilf ili ill ilm ilp ilx im- ime imf imi iml imm imp imx ipe ipf ipi ipl ipm ipp ipx ixe ixi ixl l-p lee lef lei lel lem lep lex lfe lff lfi lfl lfm lfp lfx lie lif lii lil lim lip lix lle llf lli lll llm llp lme lmf lmi lml lmm lmp lpe lpf lpi lpl lpm lpp lpx lxi lxx m-f mee mef mei mel mem mep mex mfe mff mfi mfl mfm mfp mi- mie mif mii mil mim mip mix mle mlf mli mll mlm mlp mlx mme mmf mmi mml mmm mmp mmx mpe mpf mpi mpl mpm mpp mpx mxi mxl mxp p-p pee pef pei pel pem pep pex pfe pff pfi pfl pfm pfp pfx pie pif pii pil pim pip pix ple plf pli pll plm plp plx pme pmf pmi pml pmm pmp pmx ppe ppf ppi ppl ppm ppp ppx pxe pxl pxm xee xel xem xep xex xfe xfl xfm xfx xie xii xix xlf xli xlm xmf xmi xml xmm xmp xmx xpe xpf xpl xpm xpp xxi xxl xxp xxx