bbb bbd bbr bbs bby bdb bdd bdr bds bdy brb brd brr brs bry bsb bsd bsr bss bsy by- byd byr bys dbb dbd dbr dbs dby ddb ddd ddr dds ddy drb drd drr drs dry dsb dsd dsr dss dsy dy- dyb dyd dyr dys dyy rbb rbd rbr rbs rdb rdd rdr rds rdy rrb rrd rrr rrs rsb rsd rsr rss ry- ryd ryr rys ryy sbb sbd sbr sbs sby sdb sdd sdr sds sdy sr- srb srd srr srs sry ss- ssb ssd ssr sss sy- syb syd syr sys ybr ybs yby yds ydy yrs ysb ysr yss ysy yyb yys yyy