b-p bbb bbn bbo bbp bbx bnb bnn bno bnp bnx bob bon boo bop box bpb bpn bpo bpp bpx bxb bxn bxo bxx nbb nbn nbo nbp nbx nnb nnn nno nnp no- nob non noo nop nox npb npn npo npp ob- obb obn obo obp obx on- onb onn ono onp onx oo- oob oon ooo oop oox op- opb opn opo opp opx ox- oxb oxn oxo oxx p-p pbb pbn pbo pbp pbx pn- pnb pnn pno pnp pnx pob pon poo pop pox ppb ppn ppo ppp ppx xbx xno xon xoo xop xox xpb xpn xpo xpp xxo xxp xxx