-er bbb bbe bbg bbi bbk bbr bbs be- beb bee beg bei bek ber bes bez bgb bge bgg bgi bgk bgr bgs bgz bi- bib bie big bii bik bir bis biz bkb bke bkg bkk bkr bks brb bre brg bri brk brr brs brz bsb bse bsg bsi bsk bsr bss bze bzr bzs bzz 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 erz es- esb ese esg esi esk esr ess eze ezr ezs ezz gbe gbg gbi gbk gbr gbs gbz ge- geb gee geg gei gek ger ges gez ggb ggg ggi ggr ggs ggz gib gie gig gii gik gir gis giz gkb gks grb gre grg gri grk grr grs gsb gse gsg gsi gsk gsr gss gzr ibb ibe ibg ibi ibk ibr ibs ibz 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 ize izi izz k-z kbb kbe kbi kbk kbr kbs kbz ke- keb kee keg kei kek ker kes kez kgb kgi kgs kib kie kig kii kik kir kis kiz 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 rez rgb rge rgg rgi rgk rgr rgs rib rie rig rii rik rir ris riz rkb rke rkg rkk rks rkz rrb rrg rri rrk rrr rrs rsb rse rsg rsi rsk rsr rss rzb rze sbb sbe sbg sbi sbk sbr sbs se- seb see seg sei sek ser ses sez 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 ssz sze szi szr z-g zbb zbr zbs zeb zee zek zer zes zez zgb zgg zgi zgs zib zie zig zik zir zis ziz zks zrs zse zsg zsi zsz zzr zzs zzz