-er bbb bbe bbg bbk bbn bbr bbs be- beb bee beg bek ben ber bes bgb bge bgg bgk bgn bgr bgs bkb bke bkg bkk bkn bkr bks bnb bne bng bnk bnn bnr bns brb bre brg brk brn brr brs bsb bse bsg bsk bsn bsr bss ebb ebe ebg ebk ebn ebr ebs eeb eee eeg eek een eer ees egb ege egg egn egr egs ekb eke ekg ekr eks en- enb ene eng enk enn enr ens erb ere erg erk ern err ers es- esb ese esg esk esn esr ess gbe gbg gbk gbn gbr gbs ge- geb gee geg gek gen ger ges ggb ggg ggn ggr ggs gkb gkn gks gnb gne gnn gnr gns grb gre grg grk grn grr grs gsb gse gsg gsk gsn gsr gss kbb kbe kbk kbn kbr kbs ke- keb kee keg kek ken ker kes kgb kgs kkb kke kkk kkn kkr kks kn- kne kng knk knn knr krg krk krn krr krs ksb kse ksg ksk ksn ksr kss nbb nbe nbg nbk nbn nbr nbs ne- neb nee neg nek nen ner nes ngb nge ngg ngk ngn ngs nke nkk nkn nkr nks nnb nne nng nnk nnn nns nrb nre nrg nrk nrn nrr nrs nsb nse nsg nsk nsn nsr nss rbb rbe rbg rbk rbn rbr rbs re- reb ree reg rek ren rer res rgb rge rgg rgk rgn rgr rgs rkb rke rkg rkk rks rnb rng rnn rnr rns rrb rrg rrk rrn rrr rrs rsb rse rsg rsk rsn rsr rss sbb sbe sbg sbk sbn sbr sbs se- seb see seg sek sen ser ses sgb sge sgg sgk sgn sgr sgs sk- skb ske skg skk skr sks snb sne sng snk snn snr sns sr- srb sre srg srk srn srr srs ss- ssb sse ssg ssk ssn ssr sss