c-- ccc cck cco ccs cct ccu ckc cko cks ckt co- coc cok coo cos cot cou csc csk cso css cst csu ctc ctk cto cts ctt ctu cuc cuk cuo cus cut cuu k-t kcc kck kcs kct kcu kkc kkk kks kkt kku koc kok koo kos kot kou ksc ksk kso kss kst ksu ktc ktk kto kts ktt ktu kuc kuk kus kut kuu oc- occ ock oco ocs oct ocu okc okk oko oks oku oo- ooc ook ooo oos oot os- osc osk oso oss ost osu ot- otc otk oto ots ott otu ou- ouc ouk ouo ous out scc sck sco scs sct scu sk- skc skk sko sks skt sku soc sok soo sos sot sou ss- ssc ssk sso sss sst ssu stc stk sto sts stt stu suc suk suo sus sut suu tcc tck tco tcs tct tcu tkc tkk tko tks tkt to- toc tok too tos tot tou tsc tsk tso tss tst tsu ttc ttk tto tts ttt ttu tuc tuk tuo tus tut tuu ucc uck uco ucs uct ucu ukc ukk uku uoc uok uoo uos uot usc usk uso uss ust usu utc utk uto uts utt utu uuc uus uut uuu