c-- ccc cce cck ccl ccs ce- cec cee cek cel ces ckc cks cl- clc cle clk cll cls csc cse csk csl css ec- ecc ece eck ecl ecs eec eee eek eel ees ekc eke ekl eks elc ele elk ell els es- esc ese esk esl ess kcc kce kck kcl kcs ke- kec kee kek kel kes kkc kke kkk kkl kks kl- klc kls ksc kse ksk ksl kss lcc lce lck lcl lcs lec lee lek lel les lkl lks llc lle llk lll lls lsc lse lsk lsl lss scc sce sck scl scs se- sec see sek sel ses sk- skc ske skk skl sks slc sle slk sll sls ss- ssc sse ssk ssl sss