-er bbb bbe bbg bbn bbr bbs be- beb bee beg ben ber bes bgb bge bgg bgn bgr bgs bnb bne bng bnn bnr bns brb bre brg brn brr brs bsb bse bsg bsn bsr bss ebb ebe ebg ebn ebr ebs eeb eee eeg een eer ees egb ege egg egn egr egs en- enb ene eng enn enr ens erb ere erg ern err ers es- esb ese esg esn esr ess gbe gbg gbn gbr gbs ge- geb gee geg gen ger ges ggb ggg ggn ggr ggs gnb gne gnn gnr gns grb gre grg grn grr grs gsb gse gsg gsn gsr gss nbb nbe nbg nbn nbr nbs ne- neb nee neg nen ner nes ngb nge ngg ngn ngs nnb nne nng nnn nns nrb nre nrg nrn nrr nrs nsb nse nsg nsn nsr nss rbb rbe rbg rbn rbr rbs re- reb ree reg ren rer res rgb rge rgg rgn rgr rgs rnb rng rnn rnr rns rrb rrg rrn rrr rrs rsb rse rsg rsn rsr rss sbb sbe sbg sbn sbr sbs se- seb see seg sen ser ses sgb sge sgg sgn sgr sgs snb sne sng snn snr sns sr- srb sre srg srn srr srs ss- ssb sse ssg ssn ssr sss