a-a a-b aaa aab aag aau aay ab- aba abb abg abu aby ag- aga agb agg agu agy au- aua aub aug ay- aya ayu b-u baa bab bag bau bay bba bbb bbg bbu bby bga bgb bgg bgu bua bub bug buu buy by- bya byg byu gaa gab gag gau gay gba gbg gbu gby gga ggb ggg ggu gu- gua gub gug guu guy gy- gya gyb ua- uaa uab uag uau uay uba ubb ubg ubu uby uga ugb ugg ugu uua uug uuu uyu yaa yab yag yau yay ybg yby yga yua yug yuu yuy yyb yyg yyu yyy