a-a a-b aaa aab aad aak aao aau aay ab- aba abb abd abk abo abu aby ad- ada adb add adk ado adu ady aka akb akd akk ako aku aoa aob aod aok aoo aou au- aua aub aud auk auo ay- aya ayd ayk ayo ayu b-u baa bab bad bak bao bau bay bba bbb bbd bbk bbo bbu bby bda bdb bdd bdk bdo bdu bdy bka bkb bkk bko boa bob bod bok boo bou boy bua bub bud buk buo buu buy by- bya byd byk byo byu daa dab dad dak dao dau day dba dbb dbd dbk dbo dbu dby dda ddb ddd ddk ddo ddu ddy dka dkb dkk dko dku doa dob dod dok doo dou doy dua dub dud duk duo duy dy- dya dyb dyd dyk dyo dyu dyy ka- kaa kab kad kak kao kau kay kba kbb kbd kbk kbo kbu kda kdb kdk kdo kdu kdy kkb kkk kku kky koa kob kod kok koo kou koy kub kud kuk kuu kuy kya kyd kyo kyu oaa oab oad oak oao oau ob- oba obb obd obk obo obu oby oda odb odd odo odu oka okb okd okk oko oku oo- ooa oob ood ook ooo ou- oua oud ouk ouo oya oyd oyo ua- uaa uab uad uak uao uau uay uba ubb ubk ubo ubu uby uda udb udd udk udo udu uka ukb ukk uku uoa uob uod uok uoo uua uuu uyo uyu yaa yab yad yak yao yau yay yby yda ydo ydy yka ykk yob yod yok yoo you yoy yua yud yuk yuo yuu yuy yyb yyu yyy