-er eee eel eem eer eet eex eie eii eil eim eir eit eix ele eli ell elm elr elt elx em- eme emi eml emm emr emt emx ere eri erl erm err ert ete eti etl etm etr ett etx ex- exe exi exl exr ext exx ie- iee iei iel iem ier iet iex iie iii iil iim iir iit iix il- ile ili ill ilm ilr ilt ilx im- ime imi iml imm imt imx ir- ire iri irl irm irr irt irx ite iti itl itm itt itx ixe ixi ixl lee lei lel lem ler let lex lie lii lil lim lir lit lix lle lli lll llm llr llt lme lmi lml lmm lmr lmt lri lrm lrr lrt lte lti ltl ltm ltr ltt ltx lxi lxr lxx m-r mee mei mel mem mer met mex mi- mie mii mil mim mir mit mix mle mli mll mlm mlr mlt mlx mme mmi mml mmm mmr mmt mmx mre mri mrl mrm mrr mrt mrx mte mti mtl mtm mtr mtt mtx mxi mxl mxr re- ree rei rel rem rer ret rex rie rii ril rim rir rit rix rle rli rll rlm rlr rlt rme rmi rml rmm rmr rmt rmx rri rrl rrm rrr rrt rte rti rtl rtm rtr rtt rtx rxr t-x te- tee tei tel tem ter tet tex tie tii til tim tir tit tix tle tli tll tlm tlr tlt tlx tme tmi tml tmm tmr tmt tmx tre tri trl trm trr trt trx tte tti ttl ttm ttr ttt ttx txe txi txl txt xee xel xem xer xet xex xie xii xit xix xli xlm xlr xlt xmi xml xmm xmr xmt xmx xrt xrx xti xtm xtr xtx xxi xxl xxx