-er -ic c-- ccc cce cci ccr ccs cct ce- cec cee cei cer ces cet ci- cic cie cii cir cis cit crc cre cri crr crs crt csc cse csi csr css cst ctc cte cti ctr cts ctt ec- ecc ece eci ecr ecs ect eec eee eer ees eet eic eie eii eir eis eit erc ere eri err ers ert es- esc ese esi esr ess est etc ete eti etr ets ett icc ice ici icr ics ict ie- iec iee iei ier ies iet iic iie iii iir iis iit ir- irc ire iri irr irs irt is- isc ise isi isr iss ist itc ite iti its itt rcc rce rci rcr rcs rct re- rec ree rei rer res ret ric rie rii rir ris rit rrc rri rrr rrs rrt rsc rse rsi rsr rss rst rtc rte rti rtr rts rtt scc sce sci scr scs sct se- sec see sei ser ses set sic sie sii sir sis sit sr- src sre sri srr srs srt ss- ssc sse ssi ssr sss sst stc ste sti str sts stt tcc tce tci tcr tcs tct te- tec tee tei ter tes tet tic tie tii tir tis tit trc tre tri trr trs trt tsc tse tsi tsr tss tst ttc tte tti ttr tts ttt