-er bbb bbd bbe bbg bbo bbr bbs bdb bdd bde bdg bdo bdr bds be- beb bed bee beg beo ber bes bgb bgd bge bgg bgo bgr bgs bob bod boe bog boo bor bos brb brd bre brg bro brr brs bsb bsd bse bsg bso bsr bss dbb dbd dbe dbg dbo dbr dbs ddb ddd dde ddg ddo ddr dds de- deb ded dee deg deo der des dgd dge dgg dgr dgs dob dod doe dog doo dor dos drb drd dre drg dro drr drs dsb dsd dse dsg dso dsr dss ebb ebd ebe ebg ebo ebr ebs ed- edb edd ede edg edo edr eds eeb eed eee eeg eeo eer ees egb egd ege egg ego egr egs eo- eob eod eoe eog eoo eor eos erb erd ere erg ero err ers es- esb esd ese esg eso esr ess g-d gbd gbe gbg gbo gbr gbs gdb gdd gde gdo gdr gds ge- geb ged gee geg geo ger ges ggb ggd ggg ggo ggr ggs gob god goe gog goo gor gos grb grd gre grg gro grr grs gsb gsd gse gsg gso gsr gss ob- obb obd obe obg obo obr obs odb odd ode odg odo odr ods oeb oed oee oeg oeo oer oes ogd oge ogg ogo ogs oo- oob ood oog ooo oor oos or- orb ord ore org oro orr ors os- osb osd ose osg oso osr oss rbb rbd rbe rbg rbo rbr rbs rdb rdd rde rdg rdo rdr rds re- reb red ree reg reo rer res rgb rgd rge rgg rgo rgr rgs rob rod roe rog roo ror ros rrb rrd rrg rrr rrs rsb rsd rse rsg rso rsr rss sbb sbd sbe sbg sbo sbr sbs sdb sdd sde sdg sdo sdr sds se- seb sed see seg seo ser ses sgb sgd sge sgg sgo sgr sgs sob sod soe sog soo sor sos sr- srb srd sre srg sro srr srs ss- ssb ssd sse ssg sso ssr sss