-er eee eek eer ees eie eii eik eir eis eke eki ekr eks ere eri erk err ers es- ese esi esk esr ess ie- iee iei iek ier ies iie iii iir iis ike iki ikk ikr iks ir- ire iri irk irr irs is- ise isi isk isr iss ke- kee kei kek ker kes kie kii kik kir kis kke kki kkk kkr kks kri krk krr krs kse ksi ksk ksr kss re- ree rei rek rer res rie rii rik rir ris rke rkk rks rri rrk rrr rrs rse rsi rsk rsr rss se- see sei sek ser ses sie sii sik sir sis sk- ske ski skk skr sks sr- sre sri srk srr srs ss- sse ssi ssk ssr sss