b-u bbb bbi bbk bbo bbr bbu bby bi- bib bii bik bio bir biu biy bkb bkk bko bkr bob boi bok boo bor bou boy brb bri brk bro brr bru bry bub bui buk buo bur buu buy by- byi byk byo byr byu ibb ibi ibk ibo ibr ibu iby iib iii iio iir iiu ikb iki ikk iko ikr iku io- iob ioi ioo ior iou ir- irb iri irk iro irr iru iry iu- iub iui iur iyo iyr iyy kbb kbi kbk kbo kbr kbu kib kii kik kio kir kiu kkb kki kkk kkr kku kky kob koi kok koo kor kou koy kri krk kro krr kru kry kub kui kuk kur kuu kuy kyo kyr kyu o-i ob- obb obi obk obo obr obu oby oib oii oik oio oir oiu okb oki okk oko okr oku oo- oob ooi ook ooo oor or- orb ori ork oro orr oru ory ou- oui ouk ouo our oyi oyo rbb rbi rbk rbo rbr rbu rib rii rik rio rir riy rkb rkk rko rku rky rob roi rok roo ror rou roy rrb rri rrk rrr rru rub rui ruk ruo rur ruu ruy ry- ryk ryo ryr ryu ryy ubb ubi ubk ubo ubr ubu uby uib uii uio uir uiu ukb uki ukk ukr uku uob uok uoo uor ur- urb uri urk uro urr uru ury uur uuu uyi uyo uyu ybi ybr yby yii yio yir yki ykk yob yoi yok yoo yor you yoy yro yru yui yuk yuo yur yuu yuy yyb yyu yyy