b-u bbb bbi bbn bbo bbu bi- bib bii bin bio biu bnb bni bnn bno bnu bob boi bon boo bou bub bui bun buo buu ibb ibi ibn ibo ibu iib iii iin iio iiu in- inb ini inn ino inu io- iob ioi ion ioo iou iu- iub iui n-i nbb nbi nbn nbo nbu nib nii nin nio niu nnb nni nnn nno nnu no- nob noi non noo nou nub nui nun nuo nuu o-i ob- obb obi obn obo obu oib oii oin oio oiu on- onb oni onn ono onu oo- oob ooi oon ooo ou- oui oun ouo ubb ubi ubn ubo ubu uib uii uin uio uiu un- unb uni unn uno unu uob uon uoo uun uuu