c-- ccc cck ccs cct ccu ckc cks ckt csc csk css cst csu ctc ctk cts ctt ctu cuc cuk cus cut cuu k-t kcc kck kcs kct kcu kkc kkk kks kkt kku ksc ksk kss kst ksu ktc ktk kts ktt ktu kuc kuk kus kut kuu scc sck scs sct scu sk- skc skk sks skt sku ss- ssc ssk sss sst ssu stc stk sts stt stu suc suk sus sut suu tcc tck tcs tct tcu tkc tkk tks tkt tsc tsk tss tst tsu ttc ttk tts ttt ttu tuc tuk tus tut tuu ucc uck ucs uct ucu ukc ukk uku usc usk uss ust usu utc utk uts utt utu uuc uus uut uuu