bbb bbi bbn bbo bi- bib bii bin bio biv bnb bni bnn bno bnv bob boi bon boo bov bvb bvi bvn bvo bvv i-v ibb ibi ibn ibo ibv iib iii iin iio in- inb ini inn ino inv io- iob ioi ion ioo iov ivb ivi ivo ivv n-i nbb nbi nbn nbo nbv nib nii nin nio niv nnb nni nnn nno nnv no- nob noi non noo nov nvb nvi nvn nvv o-i ob- obb obi obn obo obv oib oii oin oio oiv on- onb oni onn ono oo- oob ooi oon ooo oov ov- ovb ovi ovo ovv vbi vbo vbv vi- vib vii vin vio viv vn- vni vno vnv vob voi von voo vov vvb vvi vvo vvv