-er c-- ccc cce cck ccn ccr cct ce- cec cee cek cen cer cet ckc ckt cn- cnc cne cnn cnr cnt crc cre crk crn crr crt ctc cte ctk ctn ctr ctt ec- ecc ece eck ecn ecr ect eec eee eek een eer eet ekc eke ekr ekt en- enc ene enk enn enr ent erc ere erk ern err ert etc ete etk etn etr ett k-t kcc kce kck kcn kcr kct ke- kec kee kek ken ker ket kkc kke kkk kkn kkr kkt kn- knc kne knk knn knr knt krc krk krn krr krt ktc kte ktk ktn ktr ktt ncc nce nck ncn ncr nct ne- nec nee nek nen ner net nkc nke nkk nkn nkr nkt nnc nne nnk nnn nnt nrc nre nrk nrn nrr nrt ntc nte ntk ntn ntr ntt rcc rce rcn rcr rct re- rec ree rek ren rer ret rkc rke rkk rkt rnc rnn rnr rnt rrc rrk rrn rrr rrt rtc rte rtk rtn rtr rtt tcc tce tck tcn tcr tct te- tec tee tek ten ter tet tkc tke tkk tkr tkt tnc tne tnk tnn tnr tnt trc tre trk trn trr trt ttc tte ttk ttn ttr ttt