-er bbb bbe bbg bbi bbk bbr bbs be- beb bee beg bei bek ber bes bgb bge bgg bgi bgk bgr bgs bi- bib bie big bii bik bir bis bkb bke bkg bkk bkr bks brb bre brg bri brk brr brs bsb bse bsg bsi bsk bsr bss ebb ebe ebg ebi ebk ebr ebs eeb eee eeg eek eer ees egb ege egg egi egr egs eib eie eig eii eik eir eis ekb eke ekg eki ekr eks erb ere erg eri erk err ers es- esb ese esg esi esk esr ess gbe gbg gbi gbk gbr gbs ge- geb gee geg gei gek ger ges ggb ggg ggi ggr ggs gib gie gig gii gik gir gis gkb gks grb gre grg gri grk grr grs gsb gse gsg gsi gsk gsr gss ibb ibe ibg ibi ibk ibr ibs ie- iee ieg iei iek ier ies igb ige igg igi igk igr igs iib iie iii iir iis ikb ike iki ikk ikr iks ir- irb ire irg iri irk irr irs is- isb ise isg isi isk isr iss kbb kbe kbi kbk kbr kbs ke- keb kee keg kei kek ker kes kgb kgi kgs kib kie kig kii kik kir kis kkb kke kki kkk kkr kks krg kri krk krr krs ksb kse ksg ksi ksk ksr kss rbb rbe rbg rbi rbk rbr rbs re- reb ree reg rei rek rer res rgb rge rgg rgi rgk rgr rgs rib rie rig rii rik rir ris rkb rke rkg rkk rks rrb rrg rri rrk rrr rrs rsb rse rsg rsi rsk rsr rss sbb sbe sbg sbi sbk sbr sbs se- seb see seg sei sek ser ses sgb sge sgg sgi sgk sgr sgs sib sie sig sii sik sir sis sk- skb ske skg ski skk skr sks sr- srb sre srg sri srk srr srs ss- ssb sse ssg ssi ssk ssr sss