a-a a-b aaa aab aad aar aau aay ab- aba abb abd abr abu aby ad- ada adb add adr adu ady ar- ara arb ard arr aru ary au- aua aub aud aur ay- aya ayd ayr ayu b-u baa bab bad bar bau bay bba bbb bbd bbr bbu bby bda bdb bdd bdr bdu bdy bra brb brd brr bru bry bua bub bud bur buu buy by- bya byd byr byu daa dab dad dar dau day dba dbb dbd dbr dbu dby dda ddb ddd ddr ddu ddy dra drb drd drr dru dry dua dub dud dur duy dy- dya dyb dyd dyr dyu dyy ra- raa rab rad rar rau ray rba rbb rbd rbr rbu rda rdb rdd rdr rdu rdy rra rrb rrd rrr rru rua rub rud rur ruu ruy ry- rya ryd ryr ryu ryy ua- uaa uab uad uar uau uay uba ubb ubr ubu uby uda udb udd udr udu ur- ura urb urd urr uru ury uua uur uuu uyu yaa yab yad yar yau yay ybr yby yda ydy yra yru yua yud yur yuu yuy yyb yyu yyy