bbb bbi bbk bbn bbo bbr bi- bib bii bik bin bio bir bkb bkk bkn bko bkr bnb bni bnk bnn bno bnr bob boi bok bon boo bor brb bri brk brn bro brr ibb ibi ibk ibn ibo ibr iib iii iin iio iir ikb iki ikk iko ikr in- inb ini ink inn ino inr io- iob ioi ion ioo ior ir- irb iri irk irn iro irr kbb kbi kbk kbn kbo kbr kib kii kik kin kio kir kkb kki kkk kkn kkr kn- kni knk knn kno knr kob koi kok kon koo kor kri krk krn kro krr n-i nbb nbi nbk nbn nbo nbr nib nii nik nin nio nir nki nkk nkn nko nkr nnb nni nnk nnn nno no- nob noi nok non noo nor nrb nri nrk nrn nro nrr o-i ob- obb obi obk obn obo obr oib oii oik oin oio oir okb oki okk oko okr on- onb oni onk onn ono onr oo- oob ooi ook oon ooo oor or- orb ori ork orn oro orr rbb rbi rbk rbn rbo rbr rib rii rik rin rio rir rkb rkk rko rnb rni rnn rno rnr rob roi rok ron roo ror rrb rri rrk rrn rrr