b-p bbb bbi bbn bbo bbp bi- bib bii bin bio bip bnb bni bnn bno bnp bob boi bon boo bop bpb bpi bpn bpo bpp ibb ibi ibn ibo ibp iib iii iin iio iip in- inb ini inn ino inp io- iob ioi ion ioo iop ipb ipi ipn ipo ipp n-i nbb nbi nbn nbo nbp nib nii nin nio nip nnb nni nnn nno nnp no- nob noi non noo nop npb npi npn npo npp o-i ob- obb obi obn obo obp oib oii oin oio oip on- onb oni onn ono onp oo- oob ooi oon ooo oop op- opb opi opn opo opp p-p pbb pbi pbn pbo pbp pib pii pin pio pip pn- pnb pni pnn pno pnp pob poi pon poo pop ppb ppi ppn ppo ppp