a-a a-b a-z aaa aab aak aam aao aas aaz ab- aba abb abk abm abo abs abz aka akb akk akm ako aks ama amb amk amm amo ams amz aoa aob aok aom aoo aos as- asa asb ask asm aso ass asz az- aza azb azm azo azs azz baa bab bak bam bao bas baz bba bbb bbk bbm bbo bbs bka bkb bkk bkm bko bks bma bmb bmk bmm bmo bms bmz boa bob bok bom boo bos boz bsa bsb bsk bsm bso bss bza bzo bzs bzz k-z ka- kaa kab kak kam kao kas kaz kba kbb kbk kbm kbo kbs kbz kkb kkk kkm kks kma kmb kmk kmm kmo kms kmz koa kob kok kom koo kos koz ksa ksb ksk ksm kso kss kzo m-o maa mab mak mam mao mas maz mba mbb mbk mbm mbo mbs mka mkb mkk mkm mko mks mkz mma mmb mmk mmm mmo mms mmz moa mob mok mom moo mos moz msa msb msk msm mso mss mza mzb mzm oaa oab oak oam oao oas ob- oba obb obk obm obo obs oka okb okk oko oks om- oma omb omm omo oms omz oo- ooa oob ook oom ooo oos os- osa osb osk osm oso oss oza ozm ozo ozs ozz saa sab sak sam sao sas saz sba sbb sbk sbm sbo sbs sk- ska skb skk skm sko sks sma smb smk smm smo sms smz soa sob sok som soo sos soz ss- ssa ssb ssk ssm sso sss ssz sza zaa zab zak zam zao zas zaz zbb zbm zbs zka zks zma zmb zmk zmm zms zo- zoa zob zok zom zoo zos zsa zsm zsz zzs zzz