b-p bbb bbe bbn bbo bbp bbx be- beb bee ben beo bep bex bnb bne bnn bno bnp bnx bob boe bon boo bop box bpb bpe bpn bpo bpp bpx bxb bxn bxo bxx ebb ebe ebn ebo ebp ebx eeb eee een eeo eep eex en- enb ene enn eno enp eo- eob eoe eon eoo eop ep- epb epe epn epo epp epx ex- exe exo exp exx nbb nbe nbn nbo nbp nbx ne- neb nee nen neo nep nex nnb nne nnn nno nnp no- nob noe non noo nop nox npb npe npn npo npp ob- obb obe obn obo obp obx oeb oee oen oeo oep oex on- onb one onn ono onp onx oo- oob oon ooo oop oox op- opb ope opn opo opp opx ox- oxb oxn oxo oxx p-p pbb pbe pbn pbo pbp pbx peb pee pen peo pep pex pn- pnb pne pnn pno pnp pnx pob poe pon poo pop pox ppb ppe ppn ppo ppp ppx pxe xbe xbx xee xen xep xex xno xon xoo xop xox xpb xpe xpn xpo xpp xxo xxp xxx