c-- ccc cce cck cco ccp ce- cec cee cek ceo cep ckc cko co- coc coe cok coo cop cpc cpe cpk cpo cpp ec- ecc ece eck eco eec eee eek eeo eep ekc eke eko ekp eo- eoc eoe eok eoo eop ep- epc epe epo epp kcc kce kck kcp ke- kec kee kek keo kep kkc kke kkk kkp koc koe kok koo kop kpc kpe kpk kpo kpp oc- occ ock oco ocp oec oee oeo oep okc oke okk oko okp oo- ooc ook ooo oop op- opc ope opk opo opp p-p pcc pce pck pco pcp pec pee pek peo pep pkc pke pko pkp poc poe pok poo pop ppc ppe ppk ppo ppp