-er eee eel eem eer ees eet eex ele ell elm elr els elt elx em- eme eml emm emr ems emt emx ere erl erm err ers ert es- ese esl esm esr ess est esx ete etl etm etr ets ett etx ex- exe exl exr exs ext exx lee lel lem ler les let lex lle lll llm llr lls llt lme lml lmm lmr lms lmt lrm lrr lrs lrt lse lsl lsm lsr lss lst lte ltl ltm ltr lts ltt ltx lxr lxx m-r mee mel mem mer mes met mex mle mll mlm mlr mls mlt mlx mme mml mmm mmr mms mmt mmx mre mrl mrm mrr mrs mrt mrx mse msl msm msr mss mst msx mte mtl mtm mtr mts mtt mtx mxl mxr mxs re- ree rel rem rer res ret rex rle rll rlm rlr rls rlt rme rml rmm rmr rms rmt rmx rrl rrm rrr rrs rrt rse rsl rsm rsr rss rst rsx rte rtl rtm rtr rts rtt rtx rxr rxs se- see sel sem ser ses set sex sle sll slm slr sls slt slx sme sml smm smr sms smt smx sr- sre srl srm srr srs srt srx ss- sse ssl ssm ssr sss sst ssx ste stl stm str sts stt stx sxl sxm sxs sxt t-x te- tee tel tem ter tes tet tex tle tll tlm tlr tls tlt tlx tme tml tmm tmr tms tmt tmx tre trl trm trr trs trt trx tse tsl tsm tsr tss tst tsx tte ttl ttm ttr tts ttt ttx txe txl txs txt xee xel xem xer xes xet xex xlm xlr xls xlt xml xmm xmr xms xmt xmx xrt xrx xsl xsm xss xst xtm xtr xts xtx xxl xxx