b-u bbb bbi bbo bbr bbu bby bi- bib bii bio bir biu biy bob boi boo bor bou boy brb bri bro brr bru bry bub bui buo bur buu buy by- byi byo byr byu ibb ibi ibo ibr ibu iby iib iii iio iir iiu io- iob ioi ioo ior iou ir- irb iri iro irr iru iry iu- iub iui iur iyo iyr iyy o-i ob- obb obi obo obr obu oby oib oii oio oir oiu oo- oob ooi ooo oor or- orb ori oro orr oru ory ou- oui ouo our oyi oyo rbb rbi rbo rbr rbu rib rii rio rir riy rob roi roo ror rou roy rrb rri rrr rru rub rui ruo rur ruu ruy ry- ryo ryr ryu ryy ubb ubi ubo ubr ubu uby uib uii uio uir uiu uob uoo uor ur- urb uri uro urr uru ury uur uuu uyi uyo uyu ybi ybr yby yii yio yir yob yoi yoo yor you yoy yro yru yui yuo yur yuu yuy yyb yyu yyy