a-a a-b aaa aab aak aau aay ab- aba abb abk abu aby aka akb akk aku au- aua aub auk ay- aya ayk ayu b-u baa bab bak bau bay bba bbb bbk bbu bby bka bkb bkk bua bub buk buu buy by- bya byk byu ka- kaa kab kak kau kay kba kbb kbk kbu kkb kkk kku kky kub kuk kuu kuy kya kyu ua- uaa uab uak uau uay uba ubb ubk ubu uby uka ukb ukk uku uua uuu uyu yaa yab yak yau yay yby yka ykk yua yuk yuu yuy yyb yyu yyy