-er c-- ccc cce ccn ccr cct ce- cec cee cen cer cet cn- cnc cne cnn cnr cnt crc cre crn crr crt ctc cte ctn ctr ctt ec- ecc ece ecn ecr ect eec eee een eer eet en- enc ene enn enr ent erc ere ern err ert etc ete etn etr ett ncc nce ncn ncr nct ne- nec nee nen ner net nnc nne nnn nnt nrc nre nrn nrr nrt ntc nte ntn ntr ntt rcc rce rcn rcr rct re- rec ree ren rer ret rnc rnn rnr rnt rrc rrn rrr rrt rtc rte rtn rtr rtt tcc tce tcn tcr tct te- tec tee ten ter tet tnc tne tnn tnr tnt trc tre trn trr trt ttc tte ttn ttr ttt