c-- ccc cck ccn cco cct ckc cko ckt cn- cnc cnn cno cnt co- coc cok con coo cot ctc ctk ctn cto ctt k-t kcc kck kcn kct kkc kkk kkn kkt kn- knc knk knn kno knt koc kok kon koo kot ktc ktk ktn kto ktt ncc nck ncn nco nct nkc nkk nkn nko nkt nnc nnk nnn nno nnt no- noc nok non noo not ntc ntk ntn nto ntt oc- occ ock ocn oco oct okc okk oko on- onc onk onn ono ont oo- ooc ook oon ooo oot ot- otc otk otn oto ott tcc tck tcn tco tct tkc tkk tko tkt tnc tnk tnn tno tnt to- toc tok ton too tot ttc ttk ttn tto ttt