-er c-- ccc cce ccn ccr ccs cct ce- cec cee cen cer ces cet cn- cnc cne cnn cnr cns cnt crc cre crn crr crs crt csc cse csn csr css cst ctc cte ctn ctr cts ctt ec- ecc ece ecn ecr ecs ect eec eee een eer ees eet en- enc ene enn enr ens ent erc ere ern err ers ert es- esc ese esn esr ess est etc ete etn etr ets ett ncc nce ncn ncr ncs nct ne- nec nee nen ner nes net nnc nne nnn nns nnt nrc nre nrn nrr nrs nrt nsc nse nsn nsr nss nst ntc nte ntn ntr nts ntt rcc rce rcn rcr rcs rct re- rec ree ren rer res ret rnc rnn rnr rns rnt rrc rrn rrr rrs rrt rsc rse rsn rsr rss rst rtc rte rtn rtr rts rtt scc sce scn scr scs sct se- sec see sen ser ses set snc sne snn snr sns snt sr- src sre srn srr srs srt ss- ssc sse ssn ssr sss sst stc ste stn str sts stt tcc tce tcn tcr tcs tct te- tec tee ten ter tes tet tnc tne tnn tnr tns tnt trc tre trn trr trs trt tsc tse tsn tsr tss tst ttc tte ttn ttr tts ttt