b-p bbb bbe bbk bbo bbp be- beb bee bek beo bep bkb bke bkk bko bkp bob boe bok boo bop bpb bpe bpo bpp ebb ebe ebk ebo ebp eeb eee eek eeo eep ekb eke eko ekp eo- eob eoe eok eoo eop ep- epb epe epo epp kbb kbe kbk kbo kbp ke- keb kee kek keo kep kkb kke kkk kkp kob koe kok koo kop kpe kpk kpo kpp ob- obb obe obk obo obp oeb oee oeo oep okb oke okk oko okp oo- oob ook ooo oop op- opb ope opk opo opp p-p pbb pbe pbk pbo pbp peb pee pek peo pep pkb pke pko pkp pob poe pok poo pop ppb ppe ppk ppo ppp