bbb bbf bbi bbn bbo bbt bfb bff bfi bfn bfo bft bi- bib bif bii bin bio bit bnb bnf bni bnn bno bnt bob bof boi bon boo bot btb btf bti btn bto btt fbb fbf fbi fbn fbo fbt fff ffi ffn ffo fft fib fif fii fin fit fnb fnf fni fnn fnt fob fof foi fon foo fot ftb ftf fti ftn fto ftt i-f ibb ibf ibi ibn ibo ibt ifb iff ifi ifn ifo ift iib iif iii iin iio iit in- inb inf ini inn ino int io- iob iof ioi ion ioo iot itb itf iti itn ito itt n-i nbb nbf nbi nbn nbo nbt nfb nff nfi nfn nfo nft nib nif nii nin nio nit nnb nnf nni nnn nno nnt no- nob nof noi non noo not ntb ntf nti ntn nto ntt o-i ob- obb obf obi obn obo obt of- ofb off ofi ofn ofo oft oib oif oii oin oio oit on- onb onf oni onn ono ont oo- oob oof ooi oon ooo oot ot- otb otf oti otn oto ott tbb tbf tbi tbn tbo tbt tfb tff tfi tfn tfo tft tib tif tii tin tio tit tnb tnf tni tnn tno tnt to- tob tof toi ton too tot ttb ttf tti ttn tto ttt