-er eee eef eel eem eer eet eex ef- efe eff efi efl efm efr eft efx eie eif eii eil eim eir eit eix ele elf eli ell elm elr elt elx em- eme emf emi eml emm emr emt emx ere erf eri erl erm err ert ete etf eti etl etm etr ett etx ex- exe exi exl exr ext exx fee fef fei fel fem fer fet fex ffe fff ffi ffl ffm ffr fft ffx fie fif fii fil fim fir fit fix fle flf fli fll flm flr flt flx fme fmf fmi fml fmm fmr fmt fmx fre frf fri frl frm frr frt fte ftf fti ftl ftm ftr ftt ftx fxe fxi fxm fxr fxt fxx i-f ie- iee ief iei iel iem ier iet iex ife iff ifi ifl ifm ifr ift ifx iie iif iii iil iim iir iit iix il- ile ilf ili ill ilm ilr ilt ilx im- ime imf imi iml imm imt imx ir- ire irf iri irl irm irr irt irx ite itf iti itl itm itt itx ixe ixi ixl lee lef lei lel lem ler let lex lfe lff lfi lfl lfm lfr lft lfx lie lif lii lil lim lir lit lix lle llf lli lll llm llr llt lme lmf lmi lml lmm lmr lmt lrf lri lrm lrr lrt lte ltf lti ltl ltm ltr ltt ltx lxi lxr lxx m-f m-r mee mef mei mel mem mer met mex mfe mff mfi mfl mfm mfr mft mi- mie mif mii mil mim mir mit mix mle mlf mli mll mlm mlr mlt mlx mme mmf mmi mml mmm mmr mmt mmx mre mrf mri mrl mrm mrr mrt mrx mte mtf mti mtl mtm mtr mtt mtx mxi mxl mxr re- ree ref rei rel rem rer ret rex rfe rff rfi rfl rfm rfr rft rie rif rii ril rim rir rit rix rle rlf rli rll rlm rlr rlt rme rmf rmi rml rmm rmr rmt rmx rrf rri rrl rrm rrr rrt rte rtf rti rtl rtm rtr rtt rtx rxr t-x te- tee tef tei tel tem ter tet tex tfe tff tfi tfl tfm tfr tft tfx tie tif tii til tim tir tit tix tle tlf tli tll tlm tlr tlt tlx tme tmf tmi tml tmm tmr tmt tmx tre trf tri trl trm trr trt trx tte ttf tti ttl ttm ttr ttt ttx txe txf txi txl txt xee xel xem xer xet xex xfe xfl xfm xft xfx xie xii xit xix xlf xli xlm xlr xlt xmf xmi xml xmm xmr xmt xmx xrf xrt xrx xtf xti xtm xtr xtx xxi xxl xxx