bbb bbf bbi bbn bbo bbr bbs bfb bff bfi bfn bfo bfr bfs bi- bib bif bii bin bio bir bis bnb bnf bni bnn bno bnr bns bob bof boi bon boo bor bos brb brf bri brn bro brr brs bsb bsf bsi bsn bso bsr bss fbb fbf fbi fbn fbo fbr fbs fff ffi ffn ffo ffr ffs fib fif fii fin fir fis fnb fnf fni fnn fnr fns fob fof foi fon foo for fos frb frf fri frn fro frr frs fsb fsf fsi fsn fso fsr fss i-f ibb ibf ibi ibn ibo ibr ibs ifb iff ifi ifn ifo ifr ifs iib iif iii iin iio iir iis in- inb inf ini inn ino inr ins io- iob iof ioi ion ioo ior ios ir- irb irf iri irn iro irr irs is- isb isf isi isn iso isr iss n-i nbb nbf nbi nbn nbo nbr nbs nfb nff nfi nfn nfo nfr nfs nib nif nii nin nio nir nis nnb nnf nni nnn nno nns no- nob nof noi non noo nor nos nrb nrf nri nrn nro nrr nrs nsb nsf nsi nsn nso nsr nss o-i ob- obb obf obi obn obo obr obs of- ofb off ofi ofn ofo ofr ofs oib oif oii oin oio oir ois on- onb onf oni onn ono onr ons oo- oob oof ooi oon ooo oor oos or- orb orf ori orn oro orr ors os- osb osf osi osn oso osr oss rbb rbf rbi rbn rbo rbr rbs rfb rff rfi rfn rfo rfr rfs rib rif rii rin rio rir ris rnb rni rnn rno rnr rns rob rof roi ron roo ror ros rrb rrf rri rrn rrr rrs rsb rsf rsi rsn rso rsr rss sbb sbf sbi sbn sbo sbr sbs sfb sff sfi sfn sfo sfr sfs sib sif sii sin sio sir sis snb snf sni snn sno snr sns sob sof soi son soo sor sos sr- srb srf sri srn sro srr srs ss- ssb ssf ssi ssn sso ssr sss