a-a a-b a-z aaa aab aad aao aas aay aaz ab- aba abb abd abo abs aby abz ad- ada adb add ado ads ady adz aoa aob aod aoo aos as- asa asb asd aso ass asy asz ay- aya ayd ayo ays ayz az- aza azb azd azo azs azy azz baa bab bad bao bas bay baz bba bbb bbd bbo bbs bby bda bdb bdd bdo bds bdy bdz boa bob bod boo bos boy boz bsa bsb bsd bso bss bsy by- bya byd byo bys byz bza bzd bzo bzs bzz daa dab dad dao das day daz dba dbb dbd dbo dbs dby dbz dda ddb ddd ddo dds ddy ddz doa dob dod doo dos doy doz dsa dsb dsd dso dss dsy dsz dy- dya dyb dyd dyo dys dyy dza dzb dzd dzo dzs oaa oab oad oao oas ob- oba obb obd obo obs oby oda odb odd odo ods oo- ooa oob ood ooo oos os- osa osb osd oso oss oya oyd oyo oys oza ozo ozs ozz saa sab sad sao sas say saz sba sbb sbd sbo sbs sby sda sdb sdd sdo sds sdy sdz soa sob sod soo sos soy soz ss- ssa ssb ssd sso sss ssz sy- sya syb syd sys sza szd yaa yab yad yao yas yay yaz ybs yby ybz yda ydo yds ydy yob yod yoo yos yoy ysa ysb yso yss ysy ysz yyb yys yyy yyz yzb yzy zaa zab zad zao zas zay zaz zbb zbs zby zds zo- zoa zob zod zoo zos zsa zsz zzs zzy zzz