c-- ccc cce cck ccl ccp ccs ce- cec cee cek cel cep ces ckc cks cl- clc cle clk cll clp cls cpc cpe cpk cpl cpp cps csc cse csk csl csp css ec- ecc ece eck ecl ecs eec eee eek eel eep ees ekc eke ekl ekp eks elc ele elk ell elp els ep- epc epe epl epp eps es- esc ese esk esl esp ess kcc kce kck kcl kcp kcs ke- kec kee kek kel kep kes kkc kke kkk kkl kkp kks kl- klc kls kpc kpe kpk kpl kpp kps ksc kse ksk ksl ksp kss l-p lcc lce lck lcl lcp lcs lec lee lek lel lep les lkl lkp lks llc lle llk lll llp lls lpc lpe lpk lpl lpp lps lsc lse lsk lsl lsp lss p-p pcc pce pck pcl pcp pcs pec pee pek pel pep pes pkc pke pkl pkp pks plc ple plk pll plp pls ppc ppe ppk ppl ppp pps ps- psc pse psk psl psp pss scc sce sck scl scp scs se- sec see sek sel sep ses sk- skc ske skk skl skp sks slc sle slk sll slp sls spc spe spk spl spp sps ss- ssc sse ssk ssl ssp sss