-er bbb bbe bbi bbn bbo bbr bbs be- beb bee bei ben beo ber bes bi- bib bie bii bin bio bir bis bnb bne bni bnn bno bnr bns bob boe boi bon boo bor bos brb bre bri brn bro brr brs bsb bse bsi bsn bso bsr bss ebb ebe ebi ebn ebo ebr ebs eeb eee een eeo eer ees eib eie eii ein eio eir eis en- enb ene eni enn eno enr ens eo- eob eoe eoi eon eoo eor eos erb ere eri ern ero err ers es- esb ese esi esn eso esr ess ibb ibe ibi ibn ibo ibr ibs ie- iee iei ien ier ies iib iie iii iin iio iir iis in- inb ine ini inn ino inr ins io- iob ioe ioi ion ioo ior ios ir- irb ire iri irn iro irr irs is- isb ise isi isn iso isr iss n-i nbb nbe nbi nbn nbo nbr nbs ne- neb nee nei nen neo ner nes nib nie nii nin nio nir nis nnb nne nni nnn nno nns no- nob noe noi non noo nor nos nrb nre nri nrn nro nrr nrs nsb nse nsi nsn nso nsr nss o-i ob- obb obe obi obn obo obr obs oeb oee oei oen oeo oer oes oib oie oii oin oio oir ois on- onb one oni onn ono onr ons oo- oob ooi oon ooo oor oos or- orb ore ori orn oro orr ors os- osb ose osi osn oso osr oss rbb rbe rbi rbn rbo rbr rbs re- reb ree rei ren reo rer res rib rie rii rin rio rir ris rnb rni rnn rno rnr rns rob roe roi ron roo ror ros rrb rri rrn rrr rrs rsb rse rsi rsn rso rsr rss sbb sbe sbi sbn sbo sbr sbs se- seb see sei sen seo ser ses sib sie sii sin sio sir sis snb sne sni snn sno snr sns sob soe soi son soo sor sos sr- srb sre sri srn sro srr srs ss- ssb sse ssi ssn sso ssr sss