a-a aaa aah aao aar aas aha ahh aho ahr ahs aoa aoh aoo aor aos ar- ara arh aro arr ars as- asa ash aso asr ass haa hah hao har has hha hhh hho hhr hhs hoa hoh hoo hor hos hr- hra hrh hro hrr hrs hsa hsh hsr hss oaa oah oao oar oas oha ohh oho ohr ohs oo- ooa ooh ooo oor oos or- ora orh oro orr ors os- osa osh oso osr oss ra- raa rah rao rar ras rh- rha rhh rho rhr rhs roa roh roo ror ros rra rrh rrr rrs rsa rsh rso rsr rss saa sah sao sar sas sh- sha shh sho shr shs soa soh soo sor sos sr- sra srh sro srr srs ss- ssa ssh sso ssr sss