a-a a-b a-z aaa aab aak aam aao aar aaz ab- aba abb abk abm abo abr abz aka akb akk akm ako akr ama amb amk amm amo amr amz aoa aob aok aom aoo aor ar- ara arb ark arm aro arr arz az- aza azb azm azo azz baa bab bak bam bao bar baz bba bbb bbk bbm bbo bbr bka bkb bkk bkm bko bkr bma bmb bmk bmm bmo bmr bmz boa bob bok bom boo bor boz bra brb brk brm bro brr brz bza bzo bzr bzz k-z ka- kaa kab kak kam kao kar kaz kba kbb kbk kbm kbo kbr kbz kkb kkk kkm kkr kma kmb kmk kmm kmo kmz koa kob kok kom koo kor koz kra krk kro krr kzo m-o m-r maa mab mak mam mao mar maz mba mbb mbk mbm mbo mbr mka mkb mkk mkm mko mkr mkz mma mmb mmk mmm mmo mmr mmz moa mob mok mom moo mor moz mra mrb mrk mrm mro mrr mrz mza mzb mzm oaa oab oak oam oao oar ob- oba obb obk obm obo obr oka okb okk oko okr om- oma omb omm omo omr omz oo- ooa oob ook oom ooo oor or- ora orb ork orm oro orr orz oza ozm ozo ozz ra- raa rab rak ram rao rar raz rba rbb rbk rbm rbo rbr rkb rkk rkm rko rkz rma rmb rmm rmo rmr roa rob rok rom roo ror roz rra rrb rrk rrm rrr rza rzb rzm rzo zaa zab zak zam zao zar zaz zbb zbm zbr zka zma zmb zmk zmm zo- zoa zob zok zom zoo zor zro zzr zzz