-er -ic c-- ccc cce cci ccp ccr ce- cec cee cei cep cer ci- cic cie cii cip cir cpc cpe cpi cpp cpr crc cre cri crp crr ec- ecc ece eci ecr eec eee eep eer eic eie eii eip eir ep- epc epe epi epp epr erc ere eri erp err icc ice ici icp icr ie- iec iee iei iep ier iic iie iii iip iir ipc ipe ipi ipp ipr ir- irc ire iri irp irr p-p pcc pce pci pcp pcr pec pee pei pep per pic pie pii pip pir ppc ppe ppi ppp ppr prc pre pri prp prr rcc rce rci rcp rcr re- rec ree rei rep rer ric rie rii rip rir rpc rpe rpi rpp rpr rrc rri rrp rrr