-er -ic c-- ccc cce cci ccr ccs ce- cec cee cei cer ces ci- cic cie cii cir cis crc cre cri crr crs csc cse csi csr css ec- ecc ece eci ecr ecs eec eee eer ees eic eie eii eir eis erc ere eri err ers es- esc ese esi esr ess icc ice ici icr ics ie- iec iee iei ier ies iic iie iii iir iis ir- irc ire iri irr irs is- isc ise isi isr iss rcc rce rci rcr rcs re- rec ree rei rer res ric rie rii rir ris rrc rri rrr rrs rsc rse rsi rsr rss scc sce sci scr scs se- sec see sei ser ses sic sie sii sir sis sr- src sre sri srr srs ss- ssc sse ssi ssr sss