a-a aaa aah aao aar aas aax aha ahh aho ahr ahs ahx aoa aoh aoo aor aos aox ar- ara arh aro arr ars arx as- asa ash aso asr ass asx ax- axa axh axo axr axs axx haa hah hao har has hax hha hhh hho hhr hhs hoa hoh hoo hor hos hox hr- hra hrh hro hrr hrs hsa hsh hsr hss hsx oaa oah oao oar oas oax oha ohh oho ohr ohs oo- ooa ooh ooo oor oos oox or- ora orh oro orr ors orx os- osa osh oso osr oss osx ox- oxa oxo oxx ra- raa rah rao rar ras rax rh- rha rhh rho rhr rhs roa roh roo ror ros rox rra rrh rrr rrs rsa rsh rso rsr rss rsx rxr rxs saa sah sao sar sas sax sh- sha shh sho shr shs soa soh soo sor sos sox sr- sra srh sro srr srs srx ss- ssa ssh sso ssr sss ssx sxs xaa xar xas xoa xoo xor xos xox xrx xsa xss xxo xxx