-er -ic c-- ccc cce cci cco ccr ccs cct ce- cec cee cei ceo cer ces cet ci- cic cie cii cio cir cis cit co- coc coe coi coo cor cos cot crc cre cri cro crr crs crt csc cse csi cso csr css cst ctc cte cti cto ctr cts ctt ec- ecc ece eci eco ecr ecs ect eec eee eeo eer ees eet eic eie eii eio eir eis eit eo- eoc eoe eoi eoo eor eos eot erc ere eri ero err ers ert es- esc ese esi eso esr ess est etc ete eti eto etr ets ett icc ice ici ico icr ics ict ie- iec iee iei ier ies iet iic iie iii iio iir iis iit io- ioc ioe ioi ioo ior ios iot ir- irc ire iri iro irr irs irt is- isc ise isi iso isr iss ist itc ite iti ito its itt o-i oc- occ oci oco ocr ocs oct oec oee oei oeo oer oes oet oic oie oii oio oir ois oit oo- ooc ooi ooo oor oos oot or- orc ore ori oro orr ors ort os- osc ose osi oso osr oss ost ot- otc ote oti oto otr ots ott rcc rce rci rco rcr rcs rct re- rec ree rei reo rer res ret ric rie rii rio rir ris rit roc roe roi roo ror ros rot rrc rri rrr rrs rrt rsc rse rsi rso rsr rss rst rtc rte rti rto rtr rts rtt scc sce sci sco scr scs sct se- sec see sei seo ser ses set sic sie sii sio sir sis sit soc soe soi soo sor sos sot sr- src sre sri sro srr srs srt ss- ssc sse ssi sso ssr sss sst stc ste sti sto str sts stt tcc tce tci tco tcr tcs tct te- tec tee tei teo ter tes tet tic tie tii tio tir tis tit to- toc toe toi too tor tos tot trc tre tri tro trr trs trt tsc tse tsi tso tsr tss tst ttc tte tti tto ttr tts ttt