c-- ccc cce cck ccs cct ce- cec cee cek ces cet ckc cks ckt csc cse csk css cst ctc cte ctk cts ctt ec- ecc ece eck ecs ect eec eee eek ees eet ekc eke eks ekt es- esc ese esk ess est etc ete etk ets ett k-t kcc kce kck kcs kct ke- kec kee kek kes ket kkc kke kkk kks kkt ksc kse ksk kss kst ktc kte ktk kts ktt scc sce sck scs sct se- sec see sek ses set sk- skc ske skk sks skt ss- ssc sse ssk sss sst stc ste stk sts stt tcc tce tck tcs tct te- tec tee tek tes tet tkc tke tkk tks tkt tsc tse tsk tss tst ttc tte ttk tts ttt