-er eee eef eel eer ees eet ef- efe eff efl efr efs eft ele elf ell elr els elt ere erf erl err ers ert es- ese esf esl esr ess est ete etf etl etr ets ett fee fef fel fer fes fet ffe fff ffl ffr ffs fft fle flf fll flr fls flt fre frf frl frr frs frt fse fsf fsl fsr fss fst fte ftf ftl ftr fts ftt lee lef lel ler les let lfe lff lfl lfr lfs lft lle llf lll llr lls llt lrf lrr lrs lrt lse lsf lsl lsr lss lst lte ltf ltl ltr lts ltt re- ree ref rel rer res ret rfe rff rfl rfr rfs rft rle rlf rll rlr rls rlt rrf rrl rrr rrs rrt rse rsf rsl rsr rss rst rte rtf rtl rtr rts rtt se- see sef sel ser ses set sfe sff sfl sfr sfs sft sle slf sll slr sls slt sr- sre srf srl srr srs srt ss- sse ssf ssl ssr sss sst ste stf stl str sts stt te- tee tef tel ter tes tet tfe tff tfl tfr tfs tft tle tlf tll tlr tls tlt tre trf trl trr trs trt tse tsf tsl tsr tss tst tte ttf ttl ttr tts ttt