bbb bbd bbi bbr bbs bby bdb bdd bdi bdr bds bdy bi- bib bid bii bir bis biy brb brd bri brr brs bry bsb bsd bsi bsr bss bsy by- byd byi byr bys dbb dbd dbi dbr dbs dby ddb ddd ddi ddr dds ddy di- dib did dii dir dis diy drb drd dri drr drs dry dsb dsd dsi dsr dss dsy dy- dyb dyd dyr dys dyy i-d ibb ibd ibi ibr ibs iby idb idd idi idr ids idy iib iid iii iir iis ir- irb ird iri irr irs iry is- isb isd isi isr iss isy iyr iys iyy rbb rbd rbi rbr rbs rdb rdd rdi rdr rds rdy rib rid rii rir ris riy rrb rrd rri rrr rrs rsb rsd rsi rsr rss ry- ryd ryr rys ryy sbb sbd sbi sbr sbs sby sdb sdd sdi sdr sds sdy sib sid sii sir sis sr- srb srd sri srr srs sry ss- ssb ssd ssi ssr sss sy- syb syd syi syr sys ybi ybr ybs yby yds ydy yid yii yir yis yrs ysb ysi ysr yss ysy yyb yys yyy