-er eee eek eel eer ees eke ekl ekr eks ele elk ell elr els ere erk erl err ers es- ese esk esl esr ess ke- kee kek kel ker kes kke kkk kkl kkr kks kl- klr kls krk krl krr krs kse ksk ksl ksr kss lee lek lel ler les lkl lkr lks lle llk lll llr lls lrk lrr lrs lse lsk lsl lsr lss re- ree rek rel rer res rke rkk rks rle rll rlr rls rrk rrl rrr rrs rse rsk rsl rsr rss se- see sek sel ser ses sk- ske skk skl skr sks sle slk sll slr sls sr- sre srk srl srr srs ss- sse ssk ssl ssr sss