bbb bbi bbn bbo bby bi- bib bii bin bio biy bnb bni bnn bno bob boi bon boo boy by- byi byn byo ibb ibi ibn ibo iby iib iii iin iio in- inb ini inn ino iny io- iob ioi ion ioo iyo iyy n-i nbb nbi nbn nbo nib nii nin nio nnb nni nnn nno no- nob noi non noo noy nyn nyo nyy o-i ob- obb obi obn obo oby oib oii oin oio on- onb oni onn ono ony oo- oob ooi oon ooo oyi oyo ybi yby yii yin yio ynn yny yob yoi yon yoo yoy yyb yyy