-er -ic c-- ccc cce cci cco ccr ccs ce- cec cee cei ceo cer ces ci- cic cie cii cio cir cis co- coc coe coi coo cor cos crc cre cri cro crr crs csc cse csi cso csr css ec- ecc ece eci eco ecr ecs eec eee eeo eer ees eic eie eii eio eir eis eo- eoc eoe eoi eoo eor eos erc ere eri ero err ers es- esc ese esi eso esr ess icc ice ici ico icr ics ie- iec iee iei ier ies iic iie iii iio iir iis io- ioc ioe ioi ioo ior ios ir- irc ire iri iro irr irs is- isc ise isi iso isr iss o-i oc- occ oci oco ocr ocs oec oee oei oeo oer oes oic oie oii oio oir ois oo- ooc ooi ooo oor oos or- orc ore ori oro orr ors os- osc ose osi oso osr oss rcc rce rci rco rcr rcs re- rec ree rei reo rer res ric rie rii rio rir ris roc roe roi roo ror ros rrc rri rrr rrs rsc rse rsi rso rsr rss scc sce sci sco scr scs se- sec see sei seo ser ses sic sie sii sio sir sis soc soe soi soo sor sos sr- src sre sri sro srr srs ss- ssc sse ssi sso ssr sss