c-- ccc cce ccf cck cco ccp ce- cec cee cef cek ceo cep cfc cfe cff cfk cfo cfp ckc cko co- coc coe cof cok coo cop cpc cpe cpf cpk cpo cpp ec- ecc ece ecf eck eco eec eee eef eek eeo eep ef- efc efe eff efo efp ekc eke ekf eko ekp eo- eoc eoe eof eok eoo eop ep- epc epe epf epo epp fcc fce fcf fck fco fcp fec fee fef fek feo fep ffc ffe fff ffk ffo ffp fkc fkf fkk fkp foc foe fof fok foo fop fpc fpe fpk fpo fpp kcc kce kck kcp ke- kec kee kef kek keo kep kfc kff kfo kkc kke kkk kkp koc koe kof kok koo kop kpc kpe kpf kpk kpo kpp oc- occ ocf ock oco ocp oec oee oef oeo oep of- ofc ofe off ofo ofp okc oke okk oko okp oo- ooc oof ook ooo oop op- opc ope opf opk opo opp p-p pcc pce pcf pck pco pcp pec pee pef pek peo pep pfc pfe pff pfk pfo pfp pkc pke pkf pko pkp poc poe pof pok poo pop ppc ppe ppf ppk ppo ppp