-er a-a aaa aae aak aao aar aas aav aea aee aek aeo aer aes aev aka ake akk ako akr aks akv aoa aoe aok aoo aor aos aov ar- ara are ark aro arr ars arv as- asa ase ask aso asr ass asv av- ava ave avk avo avr avs eaa eae eak eao ear eas eav eea eee eek eeo eer ees eev eka eke eko ekr eks ekv eo- eoa eoe eok eoo eor eos era ere erk ero err ers erv es- esa ese esk eso esr ess esv eva eve evo evr evs evv ka- kaa kae kak kao kar kas kav ke- kea kee kek keo ker kes kev kke kkk kkr kks kkv koa koe kok koo kor kos kra krk kro krr krs krv ksa kse ksk kso ksr kss ksv kva kvk kvo kvr kvs kvv oaa oae oak oao oar oas oav oea oee oeo oer oes oka oke okk oko okr oks oo- ooa ook ooo oor oos oov or- ora ore ork oro orr ors orv os- osa ose osk oso osr oss osv ov- ova ove ovo ovs ovv ra- raa rae rak rao rar ras rav re- rea ree rek reo rer res rev rke rkk rko rks rkv roa roe rok roo ror ros rov rra rrk rrr rrs rsa rse rsk rso rsr rss rsv rva rve rvo rvr rvs rvv saa sae sak sao sar sas sav se- sea see sek seo ser ses sev sk- ska ske skk sko skr sks soa soe sok soo sor sos sov sr- sra sre srk sro srr srs srv ss- ssa sse ssk sso ssr sss ssv sva sve svk svo svr svs svv v-a v-e vaa vae vak vao var vas vav vea vee vek veo ver ves vka voa voe vok voo vor vos vov vra vre vrk vrr vrs vsa vse vsk vso vsr vss vsv vva vvo vvr vvs vvv