-ol eee eef eel eem eeo ees eet ef- efe eff efl efm efo efs eft ele elf ell elm elo els elt em- eme emf eml emm emo ems emt eo- eoe eof eol eom eoo eos eot es- ese esf esl esm eso ess est ete etf etl etm eto ets ett fee fef fel fem feo fes fet ffe fff ffl ffm ffo ffs fft fle flf fll flm flo fls flt fme fmf fml fmm fmo fms fmt foe fof fol fom foo fos fot fse fsf fsl fsm fso fss fst fte ftf ftl ftm fto fts ftt lee lef lel lem leo les let lfe lff lfl lfm lfo lfs lft lle llf lll llm llo lls llt lme lmf lml lmm lmo lms lmt loe lof lol lom loo los lot lse lsf lsl lsm lso lss lst lte ltf ltl ltm lto lts ltt m-f m-o mee mef mel mem meo mes met mfe mff mfl mfm mfo mfs mft mle mlf mll mlm mlo mls mlt mme mmf mml mmm mmo mms mmt moe mof mol mom moo mos mot mse msf msl msm mso mss mst mte mtf mtl mtm mto mts mtt oee oef oel oem oeo oes oet of- ofe off ofl ofm ofo ofs oft ole olf oll olm olo ols olt om- ome omf oml omm omo oms omt oo- oof ool oom ooo oos oot os- ose osf osl osm oso oss ost ot- ote otf otl otm oto ots ott se- see sef sel sem seo ses set sfe sff sfl sfm sfo sfs sft sle slf sll slm slo sls slt sme smf sml smm smo sms smt soe sof sol som soo sos sot ss- sse ssf ssl ssm sso sss sst ste stf stl stm sto sts stt te- tee tef tel tem teo tes tet tfe tff tfl tfm tfo tfs tft tle tlf tll tlm tlo tls tlt tme tmf tml tmm tmo tms tmt to- toe tof tol tom too tos tot tse tsf tsl tsm tso tss tst tte ttf ttl ttm tto tts ttt