-er bbb bbe bbf bbi bbk bbn bbr bbs be- beb bee bef bei bek ben ber bes bfb bfe bff bfi bfn bfr bfs bi- bib bie bif bii bik bin bir bis bkb bke bkf bkk bkn bkr bks bnb bne bnf bni bnk bnn bnr bns brb bre brf bri brk brn brr brs bsb bse bsf bsi bsk bsn bsr bss ebb ebe ebf ebi ebk ebn ebr ebs eeb eee eef eek een eer ees ef- efb efe eff efi efr efs eib eie eif eii eik ein eir eis ekb eke ekf eki ekr eks en- enb ene enf eni enk enn enr ens erb ere erf eri erk ern err ers es- esb ese esf esi esk esn esr ess fbb fbe fbf fbi fbk fbn fbr fbs feb fee fef fei fek fen fer fes ffe fff ffi ffk ffn ffr ffs fib fie fif fii fik fin fir fis fkb fkf fki fkk fnb fne fnf fni fnk fnn fnr fns frb fre frf fri frk frn frr frs fsb fse fsf fsi fsk fsn fsr fss i-f ibb ibe ibf ibi ibk ibn ibr ibs ie- iee ief iei iek ien ier ies ifb ife iff ifi ifn ifr ifs iib iie iif iii iin iir iis ikb ike ikf iki ikk ikr iks in- inb ine inf ini ink inn inr ins ir- irb ire irf iri irk irn irr irs is- isb ise isf isi isk isn isr iss kbb kbe kbf kbi kbk kbn kbr kbs ke- keb kee kef kei kek ken ker kes kff kfi kfs kib kie kif kii kik kin kir kis kkb kke kki kkk kkn kkr kks kn- kne knf kni knk knn knr krf kri krk krn krr krs ksb kse ksf ksi ksk ksn ksr kss n-i nbb nbe nbf nbi nbk nbn nbr nbs ne- neb nee nef nei nek nen ner nes nfb nfe nff nfi nfk nfn nfr nfs nib nie nif nii nik nin nir nis nke nkf nki nkk nkn nkr nks nnb nne nnf nni nnk nnn nns nrb nre nrf nri nrk nrn nrr nrs nsb nse nsf nsi nsk nsn nsr nss rbb rbe rbf rbi rbk rbn rbr rbs re- reb ree ref rei rek ren rer res rfb rfe rff rfi rfk rfn rfr rfs rib rie rif rii rik rin rir ris rkb rke rkf rkk rks rnb rni rnn rnr rns rrb rrf rri rrk rrn rrr rrs rsb rse rsf rsi rsk rsn rsr rss sbb sbe sbf sbi sbk sbn sbr sbs se- seb see sef sei sek sen ser ses sfb sfe sff sfi sfk sfn sfr sfs sib sie sif sii sik sin sir sis sk- skb ske skf ski skk skr sks snb sne snf sni snk snn snr sns sr- srb sre srf sri srk srn srr srs ss- ssb sse ssf ssi ssk ssn ssr sss