-er c-- ccc cce cck ccp ccr ccz ce- cec cee cek cep cer cez ckc cpc cpe cpk cpp cpr cpz crc cre crk crp crr crz cz- czc cze czk ec- ecc ece eck ecr eec eee eek eep eer ekc eke ekp ekr ep- epc epe epp epr epz erc ere erk erp err erz eze ezr ezz k-z kcc kce kck kcp kcr ke- kec kee kek kep ker kez kkc kke kkk kkp kkr kpc kpe kpk kpp kpr krc krk krp krr p-p pcc pce pck pcp pcr pec pee pek pep per pez pkc pke pkp pkr ppc ppe ppk ppp ppr ppz prc pre prk prp prr prz pzc pzk pzp rcc rce rcp rcr re- rec ree rek rep rer rez rkc rke rkk rkp rkz rpc rpe rpk rpp rpr rpz rrc rrk rrp rrr rze zce zec zee zek zep zer zez zpc zpe zpp zpr zrp zzr zzz