-er a-a aaa aae aak aao aar aas aea aee aek aeo aer aes aka ake akk ako akr aks aoa aoe aok aoo aor aos ar- ara are ark aro arr ars as- asa ase ask aso asr ass eaa eae eak eao ear eas eea eee eek eeo eer ees eka eke eko ekr eks eo- eoa eoe eok eoo eor eos era ere erk ero err ers es- esa ese esk eso esr ess ka- kaa kae kak kao kar kas ke- kea kee kek keo ker kes kke kkk kkr kks koa koe kok koo kor kos kra krk kro krr krs ksa kse ksk kso ksr kss oaa oae oak oao oar oas oea oee oeo oer oes oka oke okk oko okr oks oo- ooa ook ooo oor oos or- ora ore ork oro orr ors os- osa ose osk oso osr oss ra- raa rae rak rao rar ras re- rea ree rek reo rer res rke rkk rko rks roa roe rok roo ror ros rra rrk rrr rrs rsa rse rsk rso rsr rss saa sae sak sao sar sas se- sea see sek seo ser ses sk- ska ske skk sko skr sks soa soe sok soo sor sos sr- sra sre srk sro srr srs ss- ssa sse ssk sso ssr sss