a-a a-b aaa aab aag aar aau aay ab- aba abb abg abr abu aby ag- aga agb agg agr agu agy ar- ara arb arg arr aru ary au- aua aub aug aur ay- aya ayr ayu b-u baa bab bag bar bau bay bba bbb bbg bbr bbu bby bga bgb bgg bgr bgu bra brb brg brr bru bry bua bub bug bur buu buy by- bya byg byr byu gaa gab gag gar gau gay gba gbg gbr gbu gby gga ggb ggg ggr ggu gra grb grg grr gru gry gu- gua gub gug gur guu guy gy- gya gyb gyr ra- raa rab rag rar rau ray rba rbb rbg rbr rbu rga rgb rgg rgr rra rrb rrg rrr rru rua rub rug rur ruu ruy ry- rya ryg ryr ryu ryy ua- uaa uab uag uar uau uay uba ubb ubg ubr ubu uby uga ugb ugg ugr ugu ur- ura urb urg urr uru ury uua uug uur uuu uyu yaa yab yag yar yau yay ybg ybr yby yga yra yrg yru yua yug yur yuu yuy yyb yyg yyu yyy