a-a a-b a-z aaa aab aah aao aar aas aaz ab- aba abb abh abo abr abs abz aha ahb ahh aho ahr ahs ahz aoa aob aoh aoo aor aos ar- ara arb arh aro arr ars arz as- asa asb ash aso asr ass asz az- aza azb azo azs azz baa bab bah bao bar bas baz bba bbb bbh bbo bbr bbs bha bhb bhh bho bhr bhs boa bob boh boo bor bos boz bra brb brh bro brr brs brz bsa bsb bsh bso bsr bss bza bzh bzo bzr bzs bzz haa hab hah hao har has haz hba hbb hbh hbo hbr hbs hbz hha hhb hhh hho hhr hhs hhz hoa hob hoh hoo hor hos hr- hra hrb hrh hro hrr hrs hrz hsa hsb hsh hsr hss hsz hzo hzs oaa oab oah oao oar oas ob- oba obb obh obo obr obs oha ohh oho ohr ohs oo- ooa oob ooh ooo oor oos or- ora orb orh oro orr ors orz os- osa osb osh oso osr oss oza ozo ozs ozz ra- raa rab rah rao rar ras raz rba rbb rbh rbo rbr rbs rh- rha rhb rhh rho rhr rhs roa rob roh roo ror ros roz rra rrb rrh rrr rrs rsa rsb rsh rso rsr rss rza rzb rzo saa sab sah sao sar sas saz sba sbb sbh sbo sbr sbs sh- sha shb shh sho shr shs soa sob soh soo sor sos soz sr- sra srb srh sro srr srs ss- ssa ssb ssh sso ssr sss ssz sza szr zaa zab zah zao zar zas zaz zbb zbr zbs zha zho zhr zhs zo- zoa zob zoo zor zos zrh zro zrs zsa zsh zsz zzr zzs zzz