-er -ic c-- ccc cce cci cck ccp ccr ce- cec cee cei cek cep cer ci- cic cie cii cik cip cir ckc cki cpc cpe cpi cpk cpp cpr crc cre cri crk crp crr ec- ecc ece eci eck ecr eec eee eek eep eer eic eie eii eik eip eir ekc eke eki ekp ekr ep- epc epe epi epp epr erc ere eri erk erp err icc ice ici ick icp icr ie- iec iee iei iek iep ier iic iie iii iip iir ikc ike iki ikk ikr ipc ipe ipi ipp ipr ir- irc ire iri irk irp irr kcc kce kci kck kcp kcr ke- kec kee kei kek kep ker kic kie kii kik kip kir kkc kke kki kkk kkp kkr kpc kpe kpi kpk kpp kpr krc kri krk krp krr p-p pcc pce pci pck pcp pcr pec pee pei pek pep per pic pie pii pik pip pir pkc pke pki pkp pkr ppc ppe ppi ppk ppp ppr prc pre pri prk prp prr rcc rce rci rcp rcr re- rec ree rei rek rep rer ric rie rii rik rip rir rkc rke rkk rkp rpc rpe rpi rpk rpp rpr rrc rri rrk rrp rrr