a-a aaa aah aao aas aax aha ahh aho ahs ahx aoa aoh aoo aos aox as- asa ash aso ass asx ax- axa axh axo axs axx haa hah hao has hax hha hhh hho hhs hoa hoh hoo hos hox hsa hsh hss hsx oaa oah oao oas oax oha ohh oho ohs oo- ooa ooh ooo oos oox os- osa osh oso oss osx ox- oxa oxo oxx saa sah sao sas sax sh- sha shh sho shs soa soh soo sos sox ss- ssa ssh sso sss ssx sxs xaa xas xoa xoo xos xox xsa xss xxo xxx