bbb bbd bbi bbr bby bdb bdd bdi bdr bdy bi- bib bid bii bir biy brb brd bri brr bry by- byd byi byr dbb dbd dbi dbr dby ddb ddd ddi ddr ddy di- dib did dii dir diy drb drd dri drr dry dy- dyb dyd dyr dyy i-d ibb ibd ibi ibr iby idb idd idi idr idy iib iid iii iir ir- irb ird iri irr iry iyr iyy rbb rbd rbi rbr rdb rdd rdi rdr rdy rib rid rii rir riy rrb rrd rri rrr ry- ryd ryr ryy ybi ybr yby ydy yid yii yir yyb yyy