-er bbb bbd bbe bbg bbk bbo bbr bbs bdb bdd bde bdg bdk bdo bdr bds be- beb bed bee beg bek beo ber bes bgb bgd bge bgg bgk bgo bgr bgs bkb bke bkg bkk bko bkr bks bob bod boe bog bok boo bor bos brb brd bre brg brk bro brr brs bsb bsd bse bsg bsk bso bsr bss dbb dbd dbe dbg dbk dbo dbr dbs ddb ddd dde ddg ddk ddo ddr dds de- deb ded dee deg dek deo der des dgd dge dgg dgk dgr dgs dkb dke dkg dkk dko dkr dks dob dod doe dog dok doo dor dos drb drd dre drg drk dro drr drs dsb dsd dse dsg dsk dso dsr dss ebb ebd ebe ebg ebk ebo ebr ebs ed- edb edd ede edg edk edo edr eds eeb eed eee eeg eek eeo eer ees egb egd ege egg ego egr egs ekb ekd eke ekg eko ekr eks eo- eob eod eoe eog eok eoo eor eos erb erd ere erg erk ero err ers es- esb esd ese esg esk eso esr ess g-d gbd gbe gbg gbk gbo gbr gbs gdb gdd gde gdk gdo gdr gds ge- geb ged gee geg gek geo ger ges ggb ggd ggg ggo ggr ggs gkb gkd gko gks gob god goe gog gok goo gor gos grb grd gre grg grk gro grr grs gsb gsd gse gsg gsk gso gsr gss kbb kbd kbe kbk kbo kbr kbs kdb kde kdg kdk kdo kdr kds ke- keb ked kee keg kek keo ker kes kgb kgd kgo kgs kkb kke kkk kkr kks kob kod koe kog kok koo kor kos krd krg krk kro krr krs ksb ksd kse ksg ksk kso ksr kss ob- obb obd obe obg obk obo obr obs odb odd ode odg odo odr ods oeb oed oee oeg oeo oer oes ogd oge ogg ogo ogs okb okd oke okg okk oko okr oks oo- oob ood oog ook ooo oor oos or- orb ord ore org ork oro orr ors os- osb osd ose osg osk oso osr oss rbb rbd rbe rbg rbk rbo rbr rbs rdb rdd rde rdg rdo rdr rds re- reb red ree reg rek reo rer res rgb rgd rge rgg rgk rgo rgr rgs rkb rke rkg rkk rko rks rob rod roe rog rok roo ror ros rrb rrd rrg rrk rrr rrs rsb rsd rse rsg rsk rso rsr rss sbb sbd sbe sbg sbk sbo sbr sbs sdb sdd sde sdg sdk sdo sdr sds se- seb sed see seg sek seo ser ses sgb sgd sge sgg sgk sgo sgr sgs sk- skb skd ske skg skk sko skr sks sob sod soe sog sok soo sor sos sr- srb srd sre srg srk sro srr srs ss- ssb ssd sse ssg ssk sso ssr sss