bbb bbi bbn bbo bbr bbt bi- bib bii bin bio bir bit bnb bni bnn bno bnr bnt bob boi bon boo bor bot brb bri brn bro brr brt btb bti btn bto btr btt ibb ibi ibn ibo ibr ibt iib iii iin iio iir iit in- inb ini inn ino inr int io- iob ioi ion ioo ior iot ir- irb iri irn iro irr irt itb iti itn ito itt n-i nbb nbi nbn nbo nbr nbt nib nii nin nio nir nit nnb nni nnn nno nnt no- nob noi non noo nor not nrb nri nrn nro nrr nrt ntb nti ntn nto ntr ntt o-i ob- obb obi obn obo obr obt oib oii oin oio oir oit on- onb oni onn ono onr ont oo- oob ooi oon ooo oor oot or- orb ori orn oro orr ort ot- otb oti otn oto otr ott rbb rbi rbn rbo rbr rbt rib rii rin rio rir rit rnb rni rnn rno rnr rnt rob roi ron roo ror rot rrb rri rrn rrr rrt rtb rti rtn rto rtr rtt tbb tbi tbn tbo tbr tbt tib tii tin tio tir tit tnb tni tnn tno tnr tnt to- tob toi ton too tor tot trb tri trn tro trr trt ttb tti ttn tto ttr ttt