c-- ccc cck ccn cco ccv ckc cko cn- cnc cnn cno cnv co- coc cok con coo cov cvc cvk cvn cvo cvv kcc kck kcn kkc kkk kkn kkv kn- knc knk knn kno koc kok kon koo kvk kvn kvo kvv ncc nck ncn nco ncv nkc nkk nkn nko nnc nnk nnn nno nnv no- noc nok non noo nov nvc nvk nvn nvv oc- occ ock ocn oco ocv okc okk oko on- onc onk onn ono oo- ooc ook oon ooo oov ov- ovc ovo ovv vcc vcn vco vn- vno vnv voc vok von voo vov vvc vvo vvv