a-a a-b a-z aaa aab aah aak aao aar aaz ab- aba abb abh abk abo abr abz aha ahb ahh ahk aho ahr ahz aka akb akh akk ako akr aoa aob aoh aok aoo aor ar- ara arb arh ark aro arr arz az- aza azb azo azz baa bab bah bak bao bar baz bba bbb bbh bbk bbo bbr bha bhb bhh bhk bho bhr bka bkb bkk bko bkr boa bob boh bok boo bor boz bra brb brh brk bro brr brz bza bzh bzo bzr bzz haa hab hah hak hao har haz hba hbb hbh hbk hbo hbr hbz hha hhb hhh hhk hho hhr hhz hka hkb hkh hkk hko hkr hoa hob hoh hok hoo hor hr- hra hrb hrh hrk hro hrr hrz hzo k-z ka- kaa kab kah kak kao kar kaz kba kbb kbh kbk kbo kbr kbz kha khh khk kho khr khz kkb kkh kkk kkr koa kob koh kok koo kor koz kra krk kro krr kzo oaa oab oah oak oao oar ob- oba obb obh obk obo obr oha ohh oho ohr oka okb okk oko okr oo- ooa oob ooh ook ooo oor or- ora orb orh ork oro orr orz oza ozo ozz ra- raa rab rah rak rao rar raz rba rbb rbh rbk rbo rbr rh- rha rhb rhh rho rhr rkb rkk rko rkz roa rob roh rok roo ror roz rra rrb rrh rrk rrr rza rzb rzo zaa zab zah zak zao zar zaz zbb zbr zha zho zhr zka zo- zoa zob zok zoo zor zrh zro zzr zzz