a-a a-i aaa aai aak aao aar aas ai- aia aii aik aio air ais aka aki akk ako akr aks aoa aoi aok aoo aor aos ar- ara ari ark aro arr ars as- asa asi ask aso asr ass ia- iaa iai iao iar ias iia iii iio iir iis ika iki ikk iko ikr iks io- ioa ioi ioo ior ios ir- ira iri irk iro irr irs is- isa isi isk iso isr iss ka- kaa kai kak kao kar kas kia kii kik kio kir kis kki kkk kkr kks koa koi kok koo kor kos kra kri krk kro krr krs ksa ksi ksk kso ksr kss o-i oaa oai oak oao oar oas oia oii oik oio oir ois oka oki okk oko okr oks oo- ooa ooi ook ooo oor oos or- ora ori ork oro orr ors os- osa osi osk oso osr oss ra- raa rai rak rao rar ras ria rii rik rio rir ris rkk rko rks roa roi rok roo ror ros rra rri rrk rrr rrs rsa rsi rsk rso rsr rss saa sai sak sao sar sas sia sii sik sio sir sis sk- ska ski skk sko skr sks soa soi sok soo sor sos sr- sra sri srk sro srr srs ss- ssa ssi ssk sso ssr sss