-er eee eef eel eem eer eet eex ef- efe eff efl efm efr eft efx ele elf ell elm elr elt elx em- eme emf eml emm emr emt emx ere erf erl erm err ert ete etf etl etm etr ett etx ex- exe exl exr ext exx fee fef fel fem fer fet fex ffe fff ffl ffm ffr fft ffx fle flf fll flm flr flt flx fme fmf fml fmm fmr fmt fmx fre frf frl frm frr frt fte ftf ftl ftm ftr ftt ftx fxe fxm fxr fxt fxx lee lef lel lem ler let lex lfe lff lfl lfm lfr lft lfx lle llf lll llm llr llt lme lmf lml lmm lmr lmt lrf lrm lrr lrt lte ltf ltl ltm ltr ltt ltx lxr lxx m-f m-r mee mef mel mem mer met mex mfe mff mfl mfm mfr mft mle mlf mll mlm mlr mlt mlx mme mmf mml mmm mmr mmt mmx mre mrf mrl mrm mrr mrt mrx mte mtf mtl mtm mtr mtt mtx mxl mxr re- ree ref rel rem rer ret rex rfe rff rfl rfm rfr rft rle rlf rll rlm rlr rlt rme rmf rml rmm rmr rmt rmx rrf rrl rrm rrr rrt rte rtf rtl rtm rtr rtt rtx rxr t-x te- tee tef tel tem ter tet tex tfe tff tfl tfm tfr tft tfx tle tlf tll tlm tlr tlt tlx tme tmf tml tmm tmr tmt tmx tre trf trl trm trr trt trx tte ttf ttl ttm ttr ttt ttx txe txf txl txt xee xel xem xer xet xex xfe xfl xfm xft xfx xlf xlm xlr xlt xmf xml xmm xmr xmt xmx xrf xrt xrx xtf xtm xtr xtx xxl xxx