-er bbb bbe bbi bbn bbr bbs be- beb bee bei ben ber bes bi- bib bie bii bin bir bis bnb bne bni bnn bnr bns brb bre bri brn brr brs bsb bse bsi bsn bsr bss ebb ebe ebi ebn ebr ebs eeb eee een eer ees eib eie eii ein eir eis en- enb ene eni enn enr ens erb ere eri ern err ers es- esb ese esi esn esr ess ibb ibe ibi ibn ibr ibs ie- iee iei ien ier ies iib iie iii iin iir iis in- inb ine ini inn inr ins ir- irb ire iri irn irr irs is- isb ise isi isn isr iss n-i nbb nbe nbi nbn nbr nbs ne- neb nee nei nen ner nes nib nie nii nin nir nis nnb nne nni nnn nns nrb nre nri nrn nrr nrs nsb nse nsi nsn nsr nss rbb rbe rbi rbn rbr rbs re- reb ree rei ren rer res rib rie rii rin rir ris rnb rni rnn rnr rns rrb rri rrn rrr rrs rsb rse rsi rsn rsr rss sbb sbe sbi sbn sbr sbs se- seb see sei sen ser ses sib sie sii sin sir sis snb sne sni snn snr sns sr- srb sre sri srn srr srs ss- ssb sse ssi ssn ssr sss