a-a a-b a-z aaa aab aak aam aao aar aas aaz ab- aba abb abk abm abo abr abs abz aka akb akk akm ako akr aks ama amb amk amm amo amr ams amz aoa aob aok aom aoo aor aos ar- ara arb ark arm aro arr ars arz as- asa asb ask asm aso asr ass asz az- aza azb azm azo azs azz baa bab bak bam bao bar bas baz bba bbb bbk bbm bbo bbr bbs bka bkb bkk bkm bko bkr bks bma bmb bmk bmm bmo bmr bms bmz boa bob bok bom boo bor bos boz bra brb brk brm bro brr brs brz bsa bsb bsk bsm bso bsr bss bza bzo bzr bzs bzz k-z ka- kaa kab kak kam kao kar kas kaz kba kbb kbk kbm kbo kbr kbs kbz kkb kkk kkm kkr kks kma kmb kmk kmm kmo kms kmz koa kob kok kom koo kor kos koz kra krk kro krr krs ksa ksb ksk ksm kso ksr kss kzo m-o m-r maa mab mak mam mao mar mas maz mba mbb mbk mbm mbo mbr mbs mka mkb mkk mkm mko mkr mks mkz mma mmb mmk mmm mmo mmr mms mmz moa mob mok mom moo mor mos moz mra mrb mrk mrm mro mrr mrs mrz msa msb msk msm mso msr mss mza mzb mzm oaa oab oak oam oao oar oas ob- oba obb obk obm obo obr obs oka okb okk oko okr oks om- oma omb omm omo omr oms omz oo- ooa oob ook oom ooo oor oos or- ora orb ork orm oro orr ors orz os- osa osb osk osm oso osr oss oza ozm ozo ozs ozz ra- raa rab rak ram rao rar ras raz rba rbb rbk rbm rbo rbr rbs rkb rkk rkm rko rks rkz rma rmb rmm rmo rmr rms roa rob rok rom roo ror ros roz rra rrb rrk rrm rrr rrs rsa rsb rsk rsm rso rsr rss rza rzb rzm rzo saa sab sak sam sao sar sas saz sba sbb sbk sbm sbo sbr sbs sk- ska skb skk skm sko skr sks sma smb smk smm smo smr sms smz soa sob sok som soo sor sos soz sr- sra srb srk srm sro srr srs ss- ssa ssb ssk ssm sso ssr sss ssz sza szr zaa zab zak zam zao zar zas zaz zbb zbm zbr zbs zka zks zma zmb zmk zmm zms zo- zoa zob zok zom zoo zor zos zro zrs zsa zsm zsz zzr zzs zzz