c-- ccc cce cck ccl ccs cct ce- cec cee cek cel ces cet ckc cks ckt cl- clc cle clk cll cls clt csc cse csk csl css cst ctc cte ctk ctl cts ctt ec- ecc ece eck ecl ecs ect eec eee eek eel ees eet ekc eke ekl eks ekt elc ele elk ell els elt es- esc ese esk esl ess est etc ete etk etl ets ett k-t kcc kce kck kcl kcs kct ke- kec kee kek kel kes ket kkc kke kkk kkl kks kkt kl- klc kls klt ksc kse ksk ksl kss kst ktc kte ktk ktl kts ktt lcc lce lck lcl lcs lct lec lee lek lel les let lkl lks lkt llc lle llk lll lls llt lsc lse lsk lsl lss lst ltc lte ltk ltl lts ltt scc sce sck scl scs sct se- sec see sek sel ses set sk- skc ske skk skl sks skt slc sle slk sll sls slt ss- ssc sse ssk ssl sss sst stc ste stk stl sts stt tcc tce tck tcl tcs tct te- tec tee tek tel tes tet tkc tke tkk tkl tks tkt tlc tle tlk tll tls tlt tsc tse tsk tsl tss tst ttc tte ttk ttl tts ttt