bbb bbf bbi bbn bbo bbr bfb bff bfi bfn bfo bfr bi- bib bif bii bin bio bir bnb bnf bni bnn bno bnr bob bof boi bon boo bor brb brf bri brn bro brr fbb fbf fbi fbn fbo fbr fff ffi ffn ffo ffr fib fif fii fin fir fnb fnf fni fnn fnr fob fof foi fon foo for frb frf fri frn fro frr i-f ibb ibf ibi ibn ibo ibr ifb iff ifi ifn ifo ifr iib iif iii iin iio iir in- inb inf ini inn ino inr io- iob iof ioi ion ioo ior ir- irb irf iri irn iro irr n-i nbb nbf nbi nbn nbo nbr nfb nff nfi nfn nfo nfr nib nif nii nin nio nir nnb nnf nni nnn nno no- nob nof noi non noo nor nrb nrf nri nrn nro nrr o-i ob- obb obf obi obn obo obr of- ofb off ofi ofn ofo ofr oib oif oii oin oio oir on- onb onf oni onn ono onr oo- oob oof ooi oon ooo oor or- orb orf ori orn oro orr rbb rbf rbi rbn rbo rbr rfb rff rfi rfn rfo rfr rib rif rii rin rio rir rnb rni rnn rno rnr rob rof roi ron roo ror rrb rrf rri rrn rrr