Hi I have a problem. Please help me. Let $G$ be a finite group and $N$ is a normal subgroup of $G$. Consider $K_G(A)$ be the number of conjugacy classes of $G$ that intersect $A$ nontrivially. I want to classify groups $G$ in which $K_G(G-N)=4$. Is there a Gap-program to give me the groups satisfying above condition? Thank you Zeinab