b-u bbb bbd bbi bbr bbu bby bdb bdd bdi bdr bdu bdy bi- bib bid bii bir biu biy brb brd bri brr bru bry bub bud bui bur buu buy by- byd byi byr byu dbb dbd dbi dbr dbu dby ddb ddd ddi ddr ddu ddy di- dib did dii dir diu diy drb drd dri drr dru dry dub dud dui dur duy dy- dyb dyd dyr dyu dyy i-d ibb ibd ibi ibr ibu iby idb idd idi idr idu idy iib iid iii iir iiu ir- irb ird iri irr iru iry iu- iub iud iui iur iyr iyy rbb rbd rbi rbr rbu rdb rdd rdi rdr rdu rdy rib rid rii rir riy rrb rrd rri rrr rru rub rud rui rur ruu ruy ry- ryd ryr ryu ryy ubb ubi ubr ubu uby udb udd udi udr udu uib uid uii uir uiu ur- urb urd uri urr uru ury uur uuu uyi uyu ybi ybr yby ydy yid yii yir yru yud yui yur yuu yuy yyb yyu yyy