Consider the following premises. For all x_7, x_7 is a doctor or x_7 is excited. There is at least one x_7 for which x_7 is curious if and only if x_7 is excited. For all x_7, x_7 is curious or x_7 is not a doctor. Can we infer the following from them? For all x_7, x_7 is not curious.
 From the fact that for all x_7, x_7 is curious or x_7 is not a doctor we can infer that for all x_7, if x_7 were a doctor, then x_7 is curious. From the fact that there is at least one x_7 for which x_7 is curious if and only if x_7 is excited we can infer that there is at least one x_7 for which if x_7 were excited, then x_7 is curious. Finally, from the fact that for all x_7, if x_7 were a doctor, then x_7 is curious, that there is at least one x_7 for which if x_7 were excited, then x_7 is curious, and that for all x_7, x_7 is a doctor or x_7 is excited we can infer that there is at least one x_7 for which x_7 is curious, which contradicts that For all x_7, x_7 is not curious. Therefore, the answer is no.