-er bbb bbe bbi bbk bbr bbs be- beb bee bei bek ber bes bez bi- bib bie bii bik bir bis biz bkb bke bkk bkr bks brb bre bri brk brr brs brz bsb bse bsi bsk bsr bss bze bzr bzs bzz ebb ebe ebi ebk ebr ebs eeb eee eek eer ees eib eie eii eik eir eis ekb eke eki ekr eks erb ere eri erk err ers erz es- esb ese esi esk esr ess eze ezr ezs ezz ibb ibe ibi ibk ibr ibs ibz ie- iee iei iek ier ies iib iie iii iir iis ikb ike iki ikk ikr iks ir- irb ire iri irk irr irs is- isb ise isi isk isr iss ize izi izz k-z kbb kbe kbi kbk kbr kbs kbz ke- keb kee kei kek ker kes kez kib kie kii kik kir kis kiz kkb kke kki kkk kkr kks kri krk krr krs ksb kse ksi ksk ksr kss rbb rbe rbi rbk rbr rbs re- reb ree rei rek rer res rez rib rie rii rik rir ris riz rkb rke rkk rks rkz rrb rri rrk rrr rrs rsb rse rsi rsk rsr rss rzb rze sbb sbe sbi sbk sbr sbs se- seb see sei sek ser ses sez sib sie sii sik sir sis sk- skb ske ski skk skr sks sr- srb sre sri srk srr srs ss- ssb sse ssi ssk ssr sss ssz sze szi szr zbb zbr zbs zeb zee zek zer zes zez zib zie zik zir zis ziz zks zrs zse zsi zsz zzr zzs zzz