a-a a-b aaa aab aah aak aao aas aay ab- aba abb abh abk abo abs aby aha ahb ahh ahk aho ahs ahy aka akb akh akk ako aks aoa aob aoh aok aoo aos as- asa asb ash ask aso ass asy ay- aya ayh ayk ayo ays baa bab bah bak bao bas bay bba bbb bbh bbk bbo bbs bby bha bhb bhh bhk bho bhs bka bkb bkk bko bks boa bob boh bok boo bos boy bsa bsb bsh bsk bso bss bsy by- bya byh byk byo bys haa hab hah hak hao has hay hba hbb hbh hbk hbo hbs hby hha hhb hhh hhk hho hhs hhy hka hkb hkh hkk hko hks hoa hob hoh hok hoo hos hoy hsa hsb hsh hsk hss hsy hy- hya hyb hyh hyo hys hyy ka- kaa kab kah kak kao kas kay kba kbb kbh kbk kbo kbs kha khh khk kho khs kkb kkh kkk kks kky koa kob koh kok koo kos koy ksa ksb ksh ksk kso kss kya kyo kys oaa oab oah oak oao oas ob- oba obb obh obk obo obs oby oha ohh oho ohs oka okb okk oko oks oo- ooa oob ooh ook ooo oos os- osa osb osh osk oso oss oya oyo oys saa sab sah sak sao sas say sba sbb sbh sbk sbo sbs sby sh- sha shb shh shk sho shs shy sk- ska skb skh skk sko sks sky soa sob soh sok soo sos soy ss- ssa ssb ssh ssk sso sss sy- sya syb syh syk sys yaa yab yah yak yao yas yay ybs yby yha yhs yka ykk yob yok yoo yos yoy ysa ysb ysk yso yss ysy yyb yys yyy