-er -ey bbb bbd bbe bbr bbw bby bdb bdd bde bdr bdw bdy be- beb bed bee ber bew bey brb brd bre brr brw bry bwb bwd bwr bwy by- byd bye byr dbb dbd dbe dbr dby ddb ddd dde ddr ddw ddy de- deb ded dee der dew dey drb drd dre drr drw dry dwb dwe dwr dww dy- dyb dyd dye dyr dyw dyy ebb ebd ebe ebr ebw eby ed- edb edd ede edr edw edy eeb eed eee eer eew eey erb erd ere err erw ery ewb ewd ewe ewr eww ewy eyd eye eyr rbb rbd rbe rbr rbw rdb rdd rde rdr rdy re- reb red ree rer rew rey rrb rrd rrr rwb rwd rwe rwr rwy ry- ryd rye ryr ryy wbb wbd wbe wbr wbw wdb wdr wdy web wed wee wer wew wey wr- wrd wre wrr wrw wry wwd wwe www wy- wyd wye wyr ybe ybr yby yde ydy yeb yed yee yer yew yey yre yyb yye yyy