c-- ccc ccf cck cco cct ccu cfc cff cfk cfo cft cfu ckc cko ckt co- coc cof cok coo cot cou ctc ctf ctk cto ctt ctu cuc cuf cuk cuo cut cuu fcc fcf fck fco fct fcu ffc fff ffk ffo fft ffu fkc fkf fkk fkt foc fof fok foo fot fou ftc ftf ftk fto ftt ftu fuf fuk fuo fut fuu k-t kcc kck kct kcu kfc kff kfo kfu kkc kkk kkt kku koc kof kok koo kot kou ktc ktf ktk kto ktt ktu kuc kuk kut kuu oc- occ ocf ock oco oct ocu of- ofc off ofo oft ofu okc okk oko oku oo- ooc oof ook ooo oot ot- otc otf otk oto ott otu ou- ouc ouf ouk ouo out tcc tcf tck tco tct tcu tfc tff tfk tfo tft tfu tkc tkk tko tkt to- toc tof tok too tot tou ttc ttf ttk tto ttt ttu tuc tuf tuk tuo tut tuu ucc ucf uck uco uct ucu ufc uff ufo uft ufu ukc ukf ukk uku uoc uok uoo uot utc utf utk uto utt utu uuc uut uuu