-er eee eef eel eer ees ef- efe eff efl efr efs ele elf ell elr els ere erf erl err ers es- ese esf esl esr ess fee fef fel fer fes ffe fff ffl ffr ffs fle flf fll flr fls fre frf frl frr frs fse fsf fsl fsr fss lee lef lel ler les lfe lff lfl lfr lfs lle llf lll llr lls lrf lrr lrs lse lsf lsl lsr lss re- ree ref rel rer res rfe rff rfl rfr rfs rle rlf rll rlr rls rrf rrl rrr rrs rse rsf rsl rsr rss se- see sef sel ser ses sfe sff sfl sfr sfs sle slf sll slr sls sr- sre srf srl srr srs ss- sse ssf ssl ssr sss