a-a a-b aaa aab aak aao aau aay ab- aba abb abk abo abu aby aka akb akk ako aku aoa aob aok aoo aou au- aua aub auk auo ay- aya ayk ayo ayu b-u baa bab bak bao bau bay bba bbb bbk bbo bbu bby bka bkb bkk bko boa bob bok boo bou boy bua bub buk buo buu buy by- bya byk byo byu ka- kaa kab kak kao kau kay kba kbb kbk kbo kbu kkb kkk kku kky koa kob kok koo kou koy kub kuk kuu kuy kya kyo kyu oaa oab oak oao oau ob- oba obb obk obo obu oby oka okb okk oko oku oo- ooa oob ook ooo ou- oua ouk ouo oya oyo ua- uaa uab uak uao uau uay uba ubb ubk ubo ubu uby uka ukb ukk uku uoa uob uok uoo uua uuu uyo uyu yaa yab yak yao yau yay yby yka ykk yob yok yoo you yoy yua yuk yuo yuu yuy yyb yyu yyy