a-a a-b a-z aaa aab aah aao aas aau aaz ab- aba abb abh abo abs abu abz aha ahb ahh aho ahs ahu ahz aoa aob aoh aoo aos aou as- asa asb ash aso ass asu asz au- aua aub auh auo aus auz az- aza azb azo azs azu azz b-u baa bab bah bao bas bau baz bba bbb bbh bbo bbs bbu bha bhb bhh bho bhs bhu boa bob boh boo bos bou boz bsa bsb bsh bso bss bsu bua bub buh buo bus buu buz bza bzh bzo bzs bzu bzz haa hab hah hao has hau haz hba hbb hbh hbo hbs hbu hbz hha hhb hhh hho hhs hhu hhz hoa hob hoh hoo hos hou hsa hsb hsh hss hsu hsz hua hub huh huo hus huu huz hzo hzs 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 oza ozo ozs ozu ozz saa sab sah sao sas sau saz sba sbb sbh sbo sbs sbu sh- sha shb shh sho shs shu soa sob soh soo sos sou soz ss- ssa ssb ssh sso sss ssu ssz sua sub suh suo sus suu suz sza szu ua- uaa uab uah uao uas uau uaz uba ubb ubh ubo ubs ubu uha uhb uhh uho uhs uhu uoa uob uoo uos usa usb ush uso uss usu usz uua uus uuu uza uzb uzh uzo uzu zaa zab zah zao zas zaz zbb zbs zha zho zhs zhu zo- zoa zob zoo zos zou zsa zsh zsu zsz zub zus zuz zzs zzz