a-a a-b a-z aaa aab aak aam aao aaz ab- aba abb abk abm abo abz aka akb akk akm ako ama amb amk amm amo amz aoa aob aok aom aoo az- aza azb azm azo azz baa bab bak bam bao baz bba bbb bbk bbm bbo bka bkb bkk bkm bko bma bmb bmk bmm bmo bmz boa bob bok bom boo boz bza bzo bzz k-z ka- kaa kab kak kam kao kaz kba kbb kbk kbm kbo kbz kkb kkk kkm kma kmb kmk kmm kmo kmz koa kob kok kom koo koz kzo m-o maa mab mak mam mao maz mba mbb mbk mbm mbo mka mkb mkk mkm mko mkz mma mmb mmk mmm mmo mmz moa mob mok mom moo moz mza mzb mzm oaa oab oak oam oao ob- oba obb obk obm obo oka okb okk oko om- oma omb omm omo omz oo- ooa oob ook oom ooo oza ozm ozo ozz zaa zab zak zam zao zaz zbb zbm zka zma zmb zmk zmm zo- zoa zob zok zom zoo zzz