c-- ccc cck ccn cco ccu ckc cko cn- cnc cnn cno cnu co- coc cok con coo cou cuc cuk cun cuo cuu kcc kck kcn kcu kkc kkk kkn kku kn- knc knk knn kno knu koc kok kon koo kou kuc kuk kun kuu ncc nck ncn nco ncu nkc nkk nkn nko nku nnc nnk nnn nno nnu no- noc nok non noo nou nuc nuk nun nuo nuu oc- occ ock ocn oco ocu okc okk oko oku on- onc onk onn ono onu oo- ooc ook oon ooo ou- ouc ouk oun ouo ucc uck ucn uco ucu ukc ukk ukn uku un- unc unk unn uno unu uoc uok uon uoo uuc uun uuu