a-a a-b a-z aaa aab aah aao aas aaz ab- aba abb abh abo abs abz aha ahb ahh aho ahs ahz aoa aob aoh aoo aos as- asa asb ash aso ass asz az- aza azb azo azs azz baa bab bah bao bas baz bba bbb bbh bbo bbs bha bhb bhh bho bhs boa bob boh boo bos boz bsa bsb bsh bso bss bza bzh bzo bzs bzz haa hab hah hao has haz hba hbb hbh hbo hbs hbz hha hhb hhh hho hhs hhz hoa hob hoh hoo hos hsa hsb hsh hss hsz hzo hzs oaa oab oah oao oas ob- oba obb obh obo obs oha ohh oho ohs oo- ooa oob ooh ooo oos os- osa osb osh oso oss oza ozo ozs ozz saa sab sah sao sas saz sba sbb sbh sbo sbs sh- sha shb shh sho shs soa sob soh soo sos soz ss- ssa ssb ssh sso sss ssz sza zaa zab zah zao zas zaz zbb zbs zha zho zhs zo- zoa zob zoo zos zsa zsh zsz zzs zzz