eee eef eel eem eet eex ef- efe eff efi efl efm eft efx eie eif eii eil eim eit eix ele elf eli ell elm elt elx em- eme emf emi eml emm emt emx ete etf eti etl etm ett etx ex- exe exi exl ext exx fee fef fei fel fem fet fex ffe fff ffi ffl ffm fft ffx fie fif fii fil fim fit fix fle flf fli fll flm flt flx fme fmf fmi fml fmm fmt fmx fte ftf fti ftl ftm ftt ftx fxe fxi fxm fxt fxx i-f ie- iee ief iei iel iem iet iex ife iff ifi ifl ifm ift ifx iie iif iii iil iim iit iix il- ile ilf ili ill ilm ilt ilx im- ime imf imi iml imm imt imx ite itf iti itl itm itt itx ixe ixi ixl lee lef lei lel lem let lex lfe lff lfi lfl lfm lft lfx lie lif lii lil lim lit lix lle llf lli lll llm llt lme lmf lmi lml lmm lmt lte ltf lti ltl ltm ltt ltx lxi lxx m-f mee mef mei mel mem met mex mfe mff mfi mfl mfm mft mi- mie mif mii mil mim mit mix mle mlf mli mll mlm mlt mlx mme mmf mmi mml mmm mmt mmx mte mtf mti mtl mtm mtt mtx mxi mxl t-x te- tee tef tei tel tem tet tex tfe tff tfi tfl tfm tft tfx tie tif tii til tim tit tix tle tlf tli tll tlm tlt tlx tme tmf tmi tml tmm tmt tmx tte ttf tti ttl ttm ttt ttx txe txf txi txl txt xee xel xem xet xex xfe xfl xfm xft xfx xie xii xit xix xlf xli xlm xlt xmf xmi xml xmm xmt xmx xtf xti xtm xtx xxi xxl xxx