bbb bbf bbi bbn bbr bfb bff bfi bfn bfr bi- bib bif bii bin bir bnb bnf bni bnn bnr brb brf bri brn brr fbb fbf fbi fbn fbr fff ffi ffn ffr fib fif fii fin fir fnb fnf fni fnn fnr frb frf fri frn frr i-f ibb ibf ibi ibn ibr ifb iff ifi ifn ifr iib iif iii iin iir in- inb inf ini inn inr ir- irb irf iri irn irr n-i nbb nbf nbi nbn nbr nfb nff nfi nfn nfr nib nif nii nin nir nnb nnf nni nnn nrb nrf nri nrn nrr rbb rbf rbi rbn rbr rfb rff rfi rfn rfr rib rif rii rin rir rnb rni rnn rnr rrb rrf rri rrn rrr