a-a a-b aaa aab aah aao aas aau ab- aba abb abh abo abs abu aha ahb ahh aho ahs ahu aoa aob aoh aoo aos aou as- asa asb ash aso ass asu au- aua aub auh auo aus b-u baa bab bah bao bas bau bba bbb bbh bbo bbs bbu bha bhb bhh bho bhs bhu boa bob boh boo bos bou bsa bsb bsh bso bss bsu bua bub buh buo bus buu haa hab hah hao has hau hba hbb hbh hbo hbs hbu hha hhb hhh hho hhs hhu hoa hob hoh hoo hos hou hsa hsb hsh hss hsu hua hub huh huo hus huu oaa oab oah oao oas oau ob- oba obb obh obo obs obu oha ohh oho ohs ohu oo- ooa oob ooh ooo oos os- osa osb osh oso oss osu ou- oua ouh ouo ous saa sab sah sao sas sau sba sbb sbh sbo sbs sbu sh- sha shb shh sho shs shu soa sob soh soo sos sou ss- ssa ssb ssh sso sss ssu sua sub suh suo sus suu ua- uaa uab uah uao uas uau uba ubb ubh ubo ubs ubu uha uhb uhh uho uhs uhu uoa uob uoo uos usa usb ush uso uss usu uua uus uuu