b-u bbb bbi bbk bbr bbu bby bi- bib bii bik bir biu biy bkb bkk bkr brb bri brk brr bru bry bub bui buk bur buu buy by- byi byk byr byu ibb ibi ibk ibr ibu iby iib iii iir iiu ikb iki ikk ikr iku ir- irb iri irk irr iru iry iu- iub iui iur iyr iyy kbb kbi kbk kbr kbu kib kii kik kir kiu kkb kki kkk kkr kku kky kri krk krr kru kry kub kui kuk kur kuu kuy kyr kyu rbb rbi rbk rbr rbu rib rii rik rir riy rkb rkk rku rky rrb rri rrk rrr rru rub rui ruk rur ruu ruy ry- ryk ryr ryu ryy ubb ubi ubk ubr ubu uby uib uii uir uiu ukb uki ukk ukr uku ur- urb uri urk urr uru ury uur uuu uyi uyu ybi ybr yby yii yir yki ykk yru yui yuk yur yuu yuy yyb yyu yyy