bbb bbf bbi bbn bbo bfb bff bfi bfn bfo bi- bib bif bii bin bio bnb bnf bni bnn bno bob bof boi bon boo fbb fbf fbi fbn fbo fff ffi ffn ffo fib fif fii fin fnb fnf fni fnn fob fof foi fon foo i-f ibb ibf ibi ibn ibo ifb iff ifi ifn ifo iib iif iii iin iio in- inb inf ini inn ino io- iob iof ioi ion ioo n-i nbb nbf nbi nbn nbo nfb nff nfi nfn nfo nib nif nii nin nio nnb nnf nni nnn nno no- nob nof noi non noo o-i ob- obb obf obi obn obo of- ofb off ofi ofn ofo oib oif oii oin oio on- onb onf oni onn ono oo- oob oof ooi oon ooo