k-t k-z kkk kkn kkt kn- knk knn kno knt kok kon koo kot koz ktk ktn kto ktt kzo nkk nkn nko nkt nnk nnn nno nnt nnz no- nok non noo not noz ntk ntn nto ntt ntz nzo nzz okk oko on- onk onn ono ont oo- ook oon ooo oot ot- otk otn oto ott otz ozo ozt ozz tkk tko tkt tkz tnk tnn tno tnt tnz to- tok ton too tot toz ttk ttn tto ttt znn zno zo- zok zon zoo zot zzt zzz