bbb bbi bbn bbo bbr bby bi- bib bii bin bio bir biy bnb bni bnn bno bnr bob boi bon boo bor boy brb bri brn bro brr bry by- byi byn byo byr ibb ibi ibn ibo ibr iby iib iii iin iio iir in- inb ini inn ino inr iny io- iob ioi ion ioo ior ir- irb iri irn iro irr iry iyo iyr iyy n-i nbb nbi nbn nbo nbr nib nii nin nio nir nnb nni nnn nno no- nob noi non noo nor noy nrb nri nrn nro nrr nry nyn nyo nyy o-i ob- obb obi obn obo obr oby oib oii oin oio oir on- onb oni onn ono onr ony oo- oob ooi oon ooo oor or- orb ori orn oro orr ory oyi oyo rbb rbi rbn rbo rbr rib rii rin rio rir riy rnb rni rnn rno rnr rny rob roi ron roo ror roy rrb rri rrn rrr ry- ryn ryo ryr ryy ybi ybr yby yii yin yio yir ynn yny yob yoi yon yoo yor yoy yrn yro yyb yyy