-er -ic c-- ccc cce cci cck ccr ccs ce- cec cee cei cek cer ces ci- cic cie cii cik cir cis ckc cki cks crc cre cri crk crr crs csc cse csi csk csr css ec- ecc ece eci eck ecr ecs eec eee eek eer ees eic eie eii eik eir eis ekc eke eki ekr eks erc ere eri erk err ers es- esc ese esi esk esr ess icc ice ici ick icr ics ie- iec iee iei iek ier ies iic iie iii iir iis ikc ike iki ikk ikr iks ir- irc ire iri irk irr irs is- isc ise isi isk isr iss kcc kce kci kck kcr kcs ke- kec kee kei kek ker kes kic kie kii kik kir kis kkc kke kki kkk kkr kks krc kri krk krr krs ksc kse ksi ksk ksr kss rcc rce rci rcr rcs re- rec ree rei rek rer res ric rie rii rik rir ris rkc rke rkk rks rrc rri rrk rrr rrs rsc rse rsi rsk rsr rss scc sce sci sck scr scs se- sec see sei sek ser ses sic sie sii sik sir sis sk- skc ske ski skk skr sks sr- src sre sri srk srr srs ss- ssc sse ssi ssk ssr sss