-er bbb bbd bbe bbg bbr bbs bdb bdd bde bdg bdr bds be- beb bed bee beg ber bes bgb bgd bge bgg bgr bgs brb brd bre brg brr brs bsb bsd bse bsg bsr bss dbb dbd dbe dbg dbr dbs ddb ddd dde ddg ddr dds de- deb ded dee deg der des dgd dge dgg dgr dgs drb drd dre drg drr drs dsb dsd dse dsg dsr dss ebb ebd ebe ebg ebr ebs ed- edb edd ede edg edr eds eeb eed eee eeg eer ees egb egd ege egg egr egs erb erd ere erg err ers es- esb esd ese esg esr ess g-d gbd gbe gbg gbr gbs gdb gdd gde gdr gds ge- geb ged gee geg ger ges ggb ggd ggg ggr ggs grb grd gre grg grr grs gsb gsd gse gsg gsr gss rbb rbd rbe rbg rbr rbs rdb rdd rde rdg rdr rds re- reb red ree reg rer res rgb rgd rge rgg rgr rgs rrb rrd rrg rrr rrs rsb rsd rse rsg rsr rss sbb sbd sbe sbg sbr sbs sdb sdd sde sdg sdr sds se- seb sed see seg ser ses sgb sgd sge sgg sgr sgs sr- srb srd sre srg srr srs ss- ssb ssd sse ssg ssr sss