-er b-p bbb bbe bbi bbk bbp bbr bbs be- beb bee bei bek bep ber bes bez bi- bib bie bii bik bip bir bis biz bkb bke bkk bkp bkr bks bpb bpe bpi bpp bpr bps brb bre bri brk brp brr brs brz bsb bse bsi bsk bsp bsr bss bze bzp bzr bzs bzz ebb ebe ebi ebk ebp ebr ebs eeb eee eek eep eer ees eib eie eii eik eip eir eis ekb eke eki ekp ekr eks ep- epb epe epi epp epr eps epz erb ere eri erk erp err ers erz es- esb ese esi esk esp esr ess eze ezr ezs ezz ibb ibe ibi ibk ibp ibr ibs ibz ie- iee iei iek iep ier ies iib iie iii iip iir iis ikb ike iki ikk ikr iks ipb ipe ipi ipp ipr ips ir- irb ire iri irk irp irr irs is- isb ise isi isk isp isr iss ize izi izz k-z kbb kbe kbi kbk kbp kbr kbs kbz ke- keb kee kei kek kep ker kes kez kib kie kii kik kip kir kis kiz kkb kke kki kkk kkp kkr kks kpe kpi kpk kpp kpr kps kri krk krp krr krs ksb kse ksi ksk ksp ksr kss p-p pbb pbe pbi pbk pbp pbr pbs pbz peb pee pei pek pep per pes pez pib pie pii pik pip pir pis piz pkb pke pki pkp pkr pks ppb ppe ppi ppk ppp ppr pps ppz prb pre pri prk prp prr prs prz ps- psb pse psi psk psp psr pss pzk pzp rbb rbe rbi rbk rbp rbr rbs re- reb ree rei rek rep rer res rez rib rie rii rik rip rir ris riz rkb rke rkk rkp rks rkz rpb rpe rpi rpk rpp rpr rps rpz rrb rri rrk rrp rrr rrs rsb rse rsi rsk rsp rsr rss rzb rze sbb sbe sbi sbk sbp sbr sbs se- seb see sei sek sep ser ses sez sib sie sii sik sip sir sis sk- skb ske ski skk skp skr sks spb spe spi spk spp spr sps spz sr- srb sre sri srk srp srr srs ss- ssb sse ssi ssk ssp ssr sss ssz sze szi szp szr zbb zbr zbs zeb zee zek zep zer zes zez zib zie zik zip zir zis ziz zks zpe zpi zpp zpr zrp zrs zse zsi zsz zzr zzs zzz