-er bbb bbe bbg bbk bbr bbs be- beb bee beg bek ber bes bez bgb bge bgg bgk bgr bgs bgz bkb bke bkg bkk bkr bks brb bre brg brk brr brs brz bsb bse bsg bsk bsr bss bze bzr bzs bzz ebb ebe ebg ebk ebr ebs eeb eee eeg eek eer ees egb ege egg egr egs ekb eke ekg ekr eks erb ere erg erk err ers erz es- esb ese esg esk esr ess eze ezr ezs ezz gbe gbg gbk gbr gbs gbz ge- geb gee geg gek ger ges gez ggb ggg ggr ggs ggz gkb gks grb gre grg grk grr grs gsb gse gsg gsk gsr gss gzr k-z kbb kbe kbk kbr kbs kbz ke- keb kee keg kek ker kes kez kgb kgs kkb kke kkk kkr kks krg krk krr krs ksb kse ksg ksk ksr kss rbb rbe rbg rbk rbr rbs re- reb ree reg rek rer res rez rgb rge rgg rgk rgr rgs rkb rke rkg rkk rks rkz rrb rrg rrk rrr rrs rsb rse rsg rsk rsr rss rzb rze sbb sbe sbg sbk sbr sbs se- seb see seg sek ser ses sez sgb sge sgg sgk sgr sgs sk- skb ske skg skk skr sks sr- srb sre srg srk srr srs ss- ssb sse ssg ssk ssr sss ssz sze szr z-g zbb zbr zbs zeb zee zek zer zes zez zgb zgg zgs zks zrs zse zsg zsz zzr zzs zzz