-er -ey bbb bbd bbe bbr bbs bbt bby bdb bdd bde bdr bds bdt bdy be- beb bed bee ber bes bet bey brb brd bre brr brs brt bry bsb bsd bse bsr bss bst bsy btb btd bte btr bts btt bty by- byd bye byr bys byt dbb dbd dbe dbr dbs dbt dby ddb ddd dde ddr dds ddt ddy de- deb ded dee der des det dey drb drd dre drr drs drt dry dsb dsd dse dsr dss dst dsy dtb dtd dte dtr dts dtt dty dy- dyb dyd dye dyr dys dyy ebb ebd ebe ebr ebs ebt eby ed- edb edd ede edr eds edt edy eeb eed eee eer ees eet eey erb erd ere err ers ert ery es- esb esd ese esr ess est esy etb etd ete etr ets ett ety eyd eye eyr eys eyt rbb rbd rbe rbr rbs rbt rdb rdd rde rdr rds rdt rdy re- reb red ree rer res ret rey rrb rrd rrr rrs rrt rsb rsd rse rsr rss rst rtb rtd rte rtr rts rtt rty ry- ryd rye ryr rys ryy sbb sbd sbe sbr sbs sbt sby sdb sdd sde sdr sds sdt sdy se- seb sed see ser ses set sey sr- srb srd sre srr srs srt sry ss- ssb ssd sse ssr sss sst stb std ste str sts stt sty sy- syb syd sye syr sys syt tbb tbd tbe tbr tbs tbt tdb tdd tde tdr tds tdt tdy te- teb ted tee ter tes tet tey trb trd tre trr trs trt try tsb tsd tse tsr tss tst tsy ttb ttd tte ttr tts ttt tty tyd tye tyr tys tyt ybe ybr ybs yby yde yds ydt ydy yeb yed yee yer yes yet yey yre yrs yrt ysb yse ysr yss yst ysy ytd yte ytr yts ytt yyb yye yys yyt yyy