b-p bbb bbe bbk bbn bbo bbp be- beb bee bek ben beo bep bkb bke bkk bkn bko bkp bnb bne bnk bnn bno bnp bob boe bok bon boo bop bpb bpe bpn bpo bpp ebb ebe ebk ebn ebo ebp eeb eee eek een eeo eep ekb eke eko ekp en- enb ene enk enn eno enp eo- eob eoe eok eon eoo eop ep- epb epe epn epo epp kbb kbe kbk kbn kbo kbp ke- keb kee kek ken keo kep kkb kke kkk kkn kkp kn- kne knk knn kno knp kob koe kok kon koo kop kpe kpk kpn kpo kpp nbb nbe nbk nbn nbo nbp ne- neb nee nek nen neo nep nke nkk nkn nko nkp nnb nne nnk nnn nno nnp no- nob noe nok non noo nop npb npe npn npo npp ob- obb obe obk obn obo obp oeb oee oen oeo oep okb oke okk oko okp on- onb one onk onn ono onp oo- oob ook oon ooo oop op- opb ope opk opn opo opp p-p pbb pbe pbk pbn pbo pbp peb pee pek pen peo pep pkb pke pkn pko pkp pn- pnb pne pnk pnn pno pnp pob poe pok pon poo pop ppb ppe ppk ppn ppo ppp