b-p bbb bbe bbn bbo bbp be- beb bee ben beo bep bnb bne bnn bno bnp bob boe bon boo bop bpb bpe bpn bpo bpp ebb ebe ebn ebo ebp eeb eee een eeo eep en- enb ene enn eno enp eo- eob eoe eon eoo eop ep- epb epe epn epo epp nbb nbe nbn nbo nbp ne- neb nee nen neo nep nnb nne nnn nno nnp no- nob noe non noo nop npb npe npn npo npp ob- obb obe obn obo obp oeb oee oen oeo oep on- onb one onn ono onp oo- oob oon ooo oop op- opb ope opn opo opp p-p pbb pbe pbn pbo pbp peb pee pen peo pep pn- pnb pne pnn pno pnp pob poe pon poo pop ppb ppe ppn ppo ppp