Consider the following premises. For all x, x is happy if and only if x is a server. Karen is not a server. Can we infer the following from them? Karen is happy.
 From the fact that for all x, x is happy if and only if x is a server we can infer that Karen is happy if and only if Karen is a server. Finally, from the fact that Karen is happy if and only if Karen is a server, and that Karen is not a server we can infer that Karen is not happy, which contradicts that Karen is happy. Therefore, the answer is no.