-er c-- ccc cce cck ccl ccn ccr ce- cec cee cek cel cen cer ckc cl- clc cle clk cll cln clr cn- cnc cne cnl cnn cnr crc cre crk crl crn crr ec- ecc ece eck ecl ecn ecr eec eee eek eel een eer ekc eke ekl ekr elc ele elk ell eln elr en- enc ene enk enl enn enr erc ere erk erl ern err kcc kce kck kcl kcn kcr ke- kec kee kek kel ken ker kkc kke kkk kkl kkn kkr kl- klc klr kn- knc kne knk knl knn knr krc krk krl krn krr lcc lce lck lcl lcn lcr lec lee lek lel len ler lkl lkr llc lle llk lll lln llr lnc lne lnk lnl lnn lnr lrc lrk lrn lrr ncc nce nck ncl ncn ncr ne- nec nee nek nel nen ner nkc nke nkk nkn nkr nlc nle nlk nll nln nlr nnc nne nnk nnl nnn nrc nre nrk nrl nrn nrr rcc rce rcl rcn rcr re- rec ree rek rel ren rer rkc rke rkk rlc rle rll rln rlr rnc rnn rnr rrc rrk rrl rrn rrr