-er eee eef eek eel eer ees ef- efe eff efi efl efr efs eie eif eii eik eil eir eis eke ekf eki ekl ekr eks ele elf eli elk ell elr els ere erf eri erk erl err ers es- ese esf esi esk esl esr ess fee fef fei fek fel fer fes ffe fff ffi ffk ffl ffr ffs fie fif fii fik fil fir fis fkf fki fkk fkl fle flf fli fll flr fls fre frf fri frk frl frr frs fse fsf fsi fsk fsl fsr fss i-f ie- iee ief iei iek iel ier ies ife iff ifi ifl ifr ifs iie iif iii iil iir iis ike ikf iki ikk ikl ikr iks il- ile ilf ili ilk ill ilr ils ir- ire irf iri irk irl irr irs is- ise isf isi isk isl isr iss ke- kee kef kei kek kel ker kes kff kfi kfs kie kif kii kik kil kir kis kke kki kkk kkl kkr kks kl- klf kli klr kls krf kri krk krl krr krs kse ksf ksi ksk ksl ksr kss lee lef lei lek lel ler les lfe lff lfi lfk lfl lfr lfs lie lif lii lik lil lir lis lkl lkr lks lle llf lli llk lll llr lls lrf lri lrk lrr lrs lse lsf lsi lsk lsl lsr lss re- ree ref rei rek rel rer res rfe rff rfi rfk rfl rfr rfs rie rif rii rik ril rir ris rke rkf rkk rks rle rlf rli rll rlr rls rrf rri rrk rrl rrr rrs rse rsf rsi rsk rsl rsr rss se- see sef sei sek sel ser ses sfe sff sfi sfk sfl sfr sfs sie sif sii sik sil sir sis sk- ske skf ski skk skl skr sks sle slf sli slk sll slr sls sr- sre srf sri srk srl srr srs ss- sse ssf ssi ssk ssl ssr sss