-er bbb bbd bbe bbf bbr bbs bdb bdd bde bdf bdr bds be- beb bed bee bef ber bes bfb bfd bfe bff bfr bfs brb brd bre brf brr brs bsb bsd bse bsf bsr bss dbb dbd dbe dbf dbr dbs ddb ddd dde ddf ddr dds de- deb ded dee def der des dfb dfd dfe dff dfr dfs drb drd dre drr drs dsb dsd dse dsf dsr dss ebb ebd ebe ebf ebr ebs ed- edb edd ede edf edr eds eeb eed eee eef eer ees ef- efb efd efe eff efr efs erb erd ere erf err ers es- esb esd ese esf esr ess fbb fbd fbe fbf fbr fbs fdb fdd fde fdf fdr fds feb fed fee fef fer fes ffd ffe fff ffr ffs frb frd fre frf frr frs fsb fsd fse fsf fsr fss rbb rbd rbe rbf rbr rbs rdb rdd rde rdf rdr rds re- reb red ree ref rer res rfb rfd rfe rff rfr rfs rrb rrd rrf rrr rrs rsb rsd rse rsf rsr rss sbb sbd sbe sbf sbr sbs sdb sdd sde sdf sdr sds se- seb sed see sef ser ses sfb sfd sfe sff sfr sfs sr- srb srd sre srf srr srs ss- ssb ssd sse ssf ssr sss