a-a a-b aaa aab aah aao aar aas aau ab- aba abb abh abo abr abs abu aha ahb ahh aho ahr ahs ahu aoa aob aoh aoo aor aos aou ar- ara arb arh aro arr ars aru as- asa asb ash aso asr ass asu au- aua aub auh auo aur aus b-u baa bab bah bao bar bas bau bba bbb bbh bbo bbr bbs bbu bha bhb bhh bho bhr bhs bhu boa bob boh boo bor bos bou bra brb brh bro brr brs bru bsa bsb bsh bso bsr bss bsu bua bub buh buo bur bus buu haa hab hah hao har has hau hba hbb hbh hbo hbr hbs hbu hha hhb hhh hho hhr hhs hhu hoa hob hoh hoo hor hos hou hr- hra hrb hrh hro hrr hrs hru hsa hsb hsh hsr hss hsu hua hub huh huo hur hus huu oaa oab oah oao oar oas oau ob- oba obb obh obo obr obs obu oha ohh oho ohr ohs ohu oo- ooa oob ooh ooo oor oos or- ora orb orh oro orr ors oru os- osa osb osh oso osr oss osu ou- oua ouh ouo our ous ra- raa rab rah rao rar ras rau rba rbb rbh rbo rbr rbs rbu rh- rha rhb rhh rho rhr rhs rhu roa rob roh roo ror ros rou rra rrb rrh rrr rrs rru rsa rsb rsh rso rsr rss rsu rua rub ruh ruo rur rus ruu saa sab sah sao sar sas sau sba sbb sbh sbo sbr sbs sbu sh- sha shb shh sho shr shs shu soa sob soh soo sor sos sou sr- sra srb srh sro srr srs ss- ssa ssb ssh sso ssr sss ssu sua sub suh suo sur sus suu ua- uaa uab uah uao uar uas uau uba ubb ubh ubo ubr ubs ubu uha uhb uhh uho uhr uhs uhu uoa uob uoo uor uos ur- ura urb uro urr urs uru usa usb ush uso usr uss usu uua uur uus uuu