-er bbb bbe bbi bbk bbl bbn bbr bbs be- beb bee bei bek bel ben ber bes bi- bib bie bii bik bil bin bir bis bkb bke bkk bkl bkn bkr bks blb ble bli blk bll bln blr bls bnb bne bni bnk bnl bnn bnr bns brb bre bri brk brl brn brr brs bsb bse bsi bsk bsl bsn bsr bss ebb ebe ebi ebk ebl ebn ebr ebs eeb eee eek eel een eer ees eib eie eii eik eil ein eir eis ekb eke eki ekl ekr eks elb ele eli elk ell eln elr els en- enb ene eni enk enl enn enr ens erb ere eri erk erl ern err ers es- esb ese esi esk esl esn esr ess ibb ibe ibi ibk ibl ibn ibr ibs ie- iee iei iek iel ien ier ies iib iie iii iil iin iir iis ikb ike iki ikk ikl ikr iks il- ilb ile ili ilk ill iln ilr ils in- inb ine ini ink inl inn inr ins ir- irb ire iri irk irl irn irr irs is- isb ise isi isk isl isn isr iss kbb kbe kbi kbk kbl kbn kbr kbs ke- keb kee kei kek kel ken ker kes kib kie kii kik kil kin kir kis kkb kke kki kkk kkl kkn kkr kks kl- klb kli klr kls kn- kne kni knk knl knn knr kri krk krl krn krr krs ksb kse ksi ksk ksl ksn ksr kss lbb lbe lbi lbk lbl lbr lbs leb lee lei lek lel len ler les lib lie lii lik lil lin lir lis lkb lkl lkr lks llb lle lli llk lll lln llr lls lnb lne lni lnk lnl lnn lnr lns lrb lri lrk lrn lrr lrs lsb lse lsi lsk lsl lsn lsr lss n-i nbb nbe nbi nbk nbl nbn nbr nbs ne- neb nee nei nek nel nen ner nes nib nie nii nik nil nin nir nis nke nki nkk nkn nkr nks nlb nle nli nlk nll nln nlr nls nnb nne nni nnk nnl nnn nns nrb nre nri nrk nrl nrn nrr nrs nsb nse nsi nsk nsl nsn nsr nss rbb rbe rbi rbk rbl rbn rbr rbs re- reb ree rei rek rel ren rer res rib rie rii rik ril rin rir ris rkb rke rkk rks rle rli rll rln rlr rls rnb rni rnn rnr rns rrb rri rrk rrl rrn rrr rrs rsb rse rsi rsk rsl rsn rsr rss sbb sbe sbi sbk sbl sbn sbr sbs se- seb see sei sek sel sen ser ses sib sie sii sik sil sin sir sis sk- skb ske ski skk skl skr sks slb sle sli slk sll sln slr sls snb sne sni snk snl snn snr sns sr- srb sre sri srk srl srn srr srs ss- ssb sse ssi ssk ssl ssn ssr sss