-er bbb bbe bbg bbk bbn bbo bbr bbs be- beb bee beg bek ben beo ber bes bgb bge bgg bgk bgn bgo bgr bgs bkb bke bkg bkk bkn bko bkr bks bnb bne bng bnk bnn bno bnr bns bob boe bog bok bon boo bor bos brb bre brg brk brn bro brr brs bsb bse bsg bsk bsn bso bsr bss ebb ebe ebg ebk ebn ebo ebr ebs eeb eee eeg eek een eeo eer ees egb ege egg egn ego egr egs ekb eke ekg eko ekr eks en- enb ene eng enk enn eno enr ens eo- eob eoe eog eok eon eoo eor eos erb ere erg erk ern ero err ers es- esb ese esg esk esn eso esr ess gbe gbg gbk gbn gbo gbr gbs ge- geb gee geg gek gen geo ger ges ggb ggg ggn ggo ggr ggs gkb gkn gko gks gnb gne gnn gno gnr gns gob goe gog gok gon goo gor gos grb gre grg grk grn gro grr grs gsb gse gsg gsk gsn gso gsr gss kbb kbe kbk kbn kbo kbr kbs ke- keb kee keg kek ken keo ker kes kgb kgo kgs kkb kke kkk kkn kkr kks kn- kne kng knk knn kno knr kob koe kog kok kon koo kor kos krg krk krn kro krr krs ksb kse ksg ksk ksn kso ksr kss nbb nbe nbg nbk nbn nbo nbr nbs ne- neb nee neg nek nen neo ner nes ngb nge ngg ngk ngn ngo ngs nke nkk nkn nko nkr nks nnb nne nng nnk nnn nno nns no- nob noe nog nok non noo nor nos nrb nre nrg nrk nrn nro nrr nrs nsb nse nsg nsk nsn nso nsr nss ob- obb obe obg obk obn obo obr obs oeb oee oeg oen oeo oer oes oge ogg ogn ogo ogs okb oke okg okk oko okr oks on- onb one ong onk onn ono onr ons oo- oob oog ook oon ooo oor oos or- orb ore org ork orn oro orr ors os- osb ose osg osk osn oso osr oss rbb rbe rbg rbk rbn rbo rbr rbs re- reb ree reg rek ren reo rer res rgb rge rgg rgk rgn rgo rgr rgs rkb rke rkg rkk rko rks rnb rng rnn rno rnr rns rob roe rog rok ron roo ror ros rrb rrg rrk rrn rrr rrs rsb rse rsg rsk rsn rso rsr rss sbb sbe sbg sbk sbn sbo sbr sbs se- seb see seg sek sen seo ser ses sgb sge sgg sgk sgn sgo sgr sgs sk- skb ske skg skk sko skr sks snb sne sng snk snn sno snr sns sob soe sog sok son soo sor sos sr- srb sre srg srk srn sro srr srs ss- ssb sse ssg ssk ssn sso ssr sss