b-u bbb bbi bbk bbo bbr bbu bby bi- bib bii bik bio bir biu biv biy bkb bkk bko bkr bkv bob boi bok boo bor bou bov boy brb bri brk bro brr bru brv bry bub bui buk buo bur buu buy bvb bvi bvk bvo bvr bvu bvv by- byi byk byo byr byu i-v ibb ibi ibk ibo ibr ibu ibv iby iib iii iio iir iiu ikb iki ikk iko ikr iku ikv io- iob ioi ioo ior iou iov ir- irb iri irk iro irr iru irv iry iu- iub iui iur ivb ivi ivo ivr ivu ivv ivy iyo iyr iyy kbb kbi kbk kbo kbr kbu kib kii kik kio kir kiu kiv kkb kki kkk kkr kku kkv kky kob koi kok koo kor kou koy kri krk kro krr kru krv kry kub kui kuk kur kuu kuy kvb kvi kvk kvo kvr kvv kyo kyr kyu o-i ob- obb obi obk obo obr obu obv oby oib oii oik oio oir oiu oiv okb oki okk oko okr oku oo- oob ooi ook ooo oor oov or- orb ori ork oro orr oru orv ory ou- oui ouk ouo our ov- ovb ovi ovo ovv oyi oyo rbb rbi rbk rbo rbr rbu rib rii rik rio rir riv riy rkb rkk rko rku rkv rky rob roi rok roo ror rou rov roy rrb rri rrk rrr rru rub rui ruk ruo rur ruu ruv ruy rvb rvi rvo rvr rvu rvv rvy ry- ryk ryo ryr ryu ryy ubb ubi ubk ubo ubr ubu ubv 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 uvb uvo uvu uvv uyi uyo uyu vbi vbk vbo vbr vbv vi- vib vii vik vio vir viu viv viy vkb vob voi vok voo vor vou vov voy vrb vri vrk vrr vru vry vuk vur vuv vvb vvi vvo vvr vvv ybi ybr yby yii yio yir yki ykk yob yoi yok yoo yor you yoy yro yru yui yuk yuo yur yuu yuv yuy yvi yvo yvr yvy yyb yyu yyy