c-- ccc cck cco cct ccu ckc cko ckt co- coc cok coo cot cou ctc ctk cto ctt ctu cuc cuk cuo cut cuu k-t kcc kck kct kcu kkc kkk kkt kku koc kok koo kot kou ktc ktk kto ktt ktu kuc kuk kut kuu oc- occ ock oco oct ocu okc okk oko oku oo- ooc ook ooo oot ot- otc otk oto ott otu ou- ouc ouk ouo out tcc tck tco tct tcu tkc tkk tko tkt to- toc tok too tot tou ttc ttk tto ttt ttu tuc tuk tuo tut tuu ucc uck uco uct ucu ukc ukk uku uoc uok uoo uot utc utk uto utt utu uuc uut uuu