-er eee eek eel eer ees eie eii eik eil eir eis eke eki ekl ekr eks ele eli elk ell elr els ere eri erk erl err ers es- ese esi esk esl esr ess ie- iee iei iek iel ier ies iie iii iil iir iis ike iki ikk ikl ikr iks il- ile ili ilk ill ilr ils ir- ire iri irk irl irr irs is- ise isi isk isl isr iss ke- kee kei kek kel ker kes kie kii kik kil kir kis kke kki kkk kkl kkr kks kl- kli klr kls kri krk krl krr krs kse ksi ksk ksl ksr kss lee lei lek lel ler les lie lii lik lil lir lis lkl lkr lks lle lli llk lll llr lls lri lrk lrr lrs lse lsi lsk lsl lsr lss re- ree rei rek rel rer res rie rii rik ril rir ris rke rkk rks rle rli rll rlr rls rri rrk rrl rrr rrs rse rsi rsk rsl rsr rss se- see sei sek sel ser ses sie sii sik sil sir sis sk- ske ski skk skl skr sks sle sli slk sll slr sls sr- sre sri srk srl srr srs ss- sse ssi ssk ssl ssr sss