-er bbb bbd bbe bbf bbo bbr bbs bdb bdd bde bdf bdo bdr bds be- beb bed bee bef beo ber bes bfb bfd bfe bff bfo bfr bfs bob bod boe bof boo bor bos brb brd bre brf bro brr brs bsb bsd bse bsf bso bsr bss dbb dbd dbe dbf dbo dbr dbs ddb ddd dde ddf ddo ddr dds de- deb ded dee def deo der des dfb dfd dfe dff dfo dfr dfs dob dod doe dof doo dor dos drb drd dre dro drr drs dsb dsd dse dsf dso dsr dss ebb ebd ebe ebf ebo ebr ebs ed- edb edd ede edf edo edr eds eeb eed eee eef eeo eer ees ef- efb efd efe eff efo efr efs eo- eob eod eoe eof eoo eor eos erb erd ere erf ero err ers es- esb esd ese esf eso esr ess fbb fbd fbe fbf fbo fbr fbs fdb fdd fde fdf fdo fdr fds feb fed fee fef feo fer fes ffd ffe fff ffo ffr ffs fob foe fof foo for fos frb frd fre frf fro frr frs fsb fsd fse fsf fso fsr fss ob- obb obd obe obf obo obr obs odb odd ode odf odo odr ods oeb oed oee oef oeo oer oes of- ofb ofd ofe off ofo ofr ofs oo- oob ood oof ooo oor oos or- orb ord ore orf oro orr ors os- osb osd ose osf oso osr oss rbb rbd rbe rbf rbo rbr rbs rdb rdd rde rdf rdo rdr rds re- reb red ree ref reo rer res rfb rfd rfe rff rfo rfr rfs rob rod roe rof roo ror ros rrb rrd rrf rrr rrs rsb rsd rse rsf rso rsr rss sbb sbd sbe sbf sbo sbr sbs sdb sdd sde sdf sdo sdr sds se- seb sed see sef seo ser ses sfb sfd sfe sff sfo sfr sfs sob sod soe sof soo sor sos sr- srb srd sre srf sro srr srs ss- ssb ssd sse ssf sso ssr sss