-ol eee eef eek eel eeo ees eet ef- efe eff efl efo efs eft eke ekf ekl eko eks ekt ele elf elk ell elo els elt eo- eoe eof eok eol eoo eos eot es- ese esf esk esl eso ess est ete etf etk etl eto ets ett fee fef fek fel feo fes fet ffe fff ffk ffl ffo ffs fft fkf fkk fkl fkt fle flf fll flo fls flt foe fof fok fol foo fos fot fse fsf fsk fsl fso fss fst fte ftf ftk ftl fto fts ftt k-t ke- kee kef kek kel keo kes ket kff kfo kfs kke kkk kkl kks kkt kl- klf klo kls klt koe kof kok kol koo kos kot kse ksf ksk ksl kso kss kst kte ktf ktk ktl kto kts ktt lee lef lek lel leo les let lfe lff lfk lfl lfo lfs lft lkl lks lkt lle llf llk lll llo lls llt loe lof lok lol loo los lot lse lsf lsk lsl lso lss lst lte ltf ltk ltl lto lts ltt oee oef oel oeo oes oet of- ofe off ofl ofo ofs oft oke okk okl oko oks ole olf olk oll olo ols olt oo- oof ook ool ooo oos oot os- ose osf osk osl oso oss ost ot- ote otf otk otl oto ots ott se- see sef sek sel seo ses set sfe sff sfk sfl sfo sfs sft sk- ske skf skk skl sko sks skt sle slf slk sll slo sls slt soe sof sok sol soo sos sot ss- sse ssf ssk ssl sso sss sst ste stf stk stl sto sts stt te- tee tef tek tel teo tes tet tfe tff tfk tfl tfo tfs tft tke tkk tkl tko tks tkt tle tlf tlk tll tlo tls tlt to- toe tof tok tol too tos tot tse tsf tsk tsl tso tss tst tte ttf ttk ttl tto tts ttt