-er -ic c-- ccc cce cci cck ccr ce- cec cee cei cek cer ci- cic cie cii cik cir ckc cki crc cre cri crk crr ec- ecc ece eci eck ecr eec eee eek eer eic eie eii eik eir ekc eke eki ekr erc ere eri erk err icc ice ici ick icr ie- iec iee iei iek ier iic iie iii iir ikc ike iki ikk ikr ir- irc ire iri irk irr kcc kce kci kck kcr ke- kec kee kei kek ker kic kie kii kik kir kkc kke kki kkk kkr krc kri krk krr rcc rce rci rcr re- rec ree rei rek rer ric rie rii rik rir rkc rke rkk rrc rri rrk rrr