b-p bbb bbn bbo bbp bby bnb bnn bno bnp bob bon boo bop boy bpb bpn bpo bpp bpy by- byn byo byp nbb nbn nbo nbp nnb nnn nno nnp no- nob non noo nop noy npb npn npo npp nyn nyo nyp nyy ob- obb obn obo obp oby on- onb onn ono onp ony oo- oob oon ooo oop op- opb opn opo opp opy oyo p-p pbb pbn pbo pbp pby pn- pnb pnn pno pnp pny pob pon poo pop poy ppb ppn ppo ppp py- pyb pyn pyo ybp yby ynn ynp yny yob yon yoo yop yoy ypo yyb yyy