bbb bbf bbi bbn bbo bbx bfb bff bfi bfn bfo bfx bi- bib bif bii bin bio bix bnb bnf bni bnn bno bnx bob bof boi bon boo box bxb bxi bxn bxo bxx fbb fbf fbi fbn fbo fbx fff ffi ffn ffo ffx fib fif fii fin fix fnb fnf fni fnn fnx fob fof foi fon foo fox fxi fxx i-f ibb ibf ibi ibn ibo ibx ifb iff ifi ifn ifo ifx iib iif iii iin iio iix in- inb inf ini inn ino inx io- iob iof ioi ion ioo ixi ixn n-i nbb nbf nbi nbn nbo nbx nfb nff nfi nfn nfo nib nif nii nin nio nix nnb nnf nni nnn nno no- nob nof noi non noo nox o-i ob- obb obf obi obn obo obx of- ofb off ofi ofn ofo ofx oib oif oii oin oio on- onb onf oni onn ono onx oo- oob oof ooi oon ooo oox ox- oxb oxf oxi oxn oxo oxx xbx xfn xfx xii xin xio xix xno xof xoi xon xoo xox xxi xxo xxx