Consider the following premises. For all x_6, if x_6 were curious, then x_6 is a mechanic. If it is cloudy, then Richard is a nurse. For all x_6, if x_6 were a mechanic, then x_6 is a nurse. It is cloudy or Richard is curious. Can we infer the following from them? Richard is not a nurse.
 From the fact that for all x_6, if x_6 were curious, then x_6 is a mechanic, and that for all x_6, if x_6 were a mechanic, then x_6 is a nurse we can infer that for all x_6, if x_6 were curious, then x_6 is a nurse. From the fact that for all x_6, if x_6 were curious, then x_6 is a nurse we can infer that if Richard were curious, then Richard is a nurse. Finally, from the fact that if it is cloudy, then Richard is a nurse, that if Richard were curious, then Richard is a nurse, and that it is cloudy or Richard is curious we can infer that Richard is a nurse, which contradicts that Richard is not a nurse. Therefore, the answer is no.