-er bbb bbe bbi bbk bbn bbr bbs be- beb bee bei bek ben ber bes bi- bib bie bii bik bin bir bis bkb bke bkk bkn bkr bks bnb bne bni bnk bnn bnr bns brb bre bri brk brn brr brs bsb bse bsi bsk bsn bsr bss ebb ebe ebi ebk ebn ebr ebs eeb eee eek een eer ees eib eie eii eik ein eir eis ekb eke eki ekr eks en- enb ene eni enk enn enr ens erb ere eri erk ern err ers es- esb ese esi esk esn esr ess ibb ibe ibi ibk ibn ibr ibs ie- iee iei iek ien ier ies iib iie iii iin iir iis ikb ike iki ikk ikr iks in- inb ine ini ink inn inr ins ir- irb ire iri irk irn irr irs is- isb ise isi isk isn isr iss kbb kbe kbi kbk kbn kbr kbs ke- keb kee kei kek ken ker kes kib kie kii kik kin kir kis kkb kke kki kkk kkn kkr kks kn- kne kni knk knn knr kri krk krn krr krs ksb kse ksi ksk ksn ksr kss n-i nbb nbe nbi nbk nbn nbr nbs ne- neb nee nei nek nen ner nes nib nie nii nik nin nir nis nke nki nkk nkn nkr nks nnb nne nni nnk nnn nns nrb nre nri nrk nrn nrr nrs nsb nse nsi nsk nsn nsr nss rbb rbe rbi rbk rbn rbr rbs re- reb ree rei rek ren rer res rib rie rii rik rin rir ris rkb rke rkk rks rnb rni rnn rnr rns rrb rri rrk rrn rrr rrs rsb rse rsi rsk rsn rsr rss sbb sbe sbi sbk sbn sbr sbs se- seb see sei sek sen ser ses sib sie sii sik sin sir sis sk- skb ske ski skk skr sks snb sne sni snk snn snr sns sr- srb sre sri srk srn srr srs ss- ssb sse ssi ssk ssn ssr sss