c-- ccc cce cck ccs cct ccu ce- cec cee cek ces cet ceu ckc cks ckt csc cse csk css cst csu ctc cte ctk cts ctt ctu cuc cue cuk cus cut cuu ec- ecc ece eck ecs ect ecu eec eee eek ees eet ekc eke eks ekt eku es- esc ese esk ess est esu etc ete etk ets ett etu eu- euc eue eus eut k-t kcc kce kck kcs kct kcu ke- kec kee kek kes ket kkc kke kkk kks kkt kku ksc kse ksk kss kst ksu ktc kte ktk kts ktt ktu kuc kue kuk kus kut kuu scc sce sck scs sct scu se- sec see sek ses set seu sk- skc ske skk sks skt sku ss- ssc sse ssk sss sst ssu stc ste stk sts stt stu suc sue suk sus sut suu tcc tce tck tcs tct tcu te- tec tee tek tes tet teu tkc tke tkk tks tkt tsc tse tsk tss tst tsu ttc tte ttk tts ttt ttu tuc tue tuk tus tut tuu ucc uce uck ucs uct ucu uec uee ues uet ukc uke ukk uku usc use usk uss ust usu utc ute utk uts utt utu uuc uue uus uut uuu