c-- ccc cce cck ccl ccn ce- cec cee cek cel cen ckc cl- clc cle clk cll cln cn- cnc cne cnl cnn ec- ecc ece eck ecl ecn eec eee eek eel een ekc eke ekl elc ele elk ell eln en- enc ene enk enl enn kcc kce kck kcl kcn ke- kec kee kek kel ken kkc kke kkk kkl kkn kl- klc kn- knc kne knk knl knn lcc lce lck lcl lcn lec lee lek lel len lkl llc lle llk lll lln lnc lne lnk lnl lnn ncc nce nck ncl ncn ne- nec nee nek nel nen nkc nke nkk nkn nlc nle nlk nll nln nnc nne nnk nnl nnn