Consider the following premises. It is not cloudy. If Richard were a mechanic, then it is cold. It is cloudy if and only if it is cold. Patricia is a scientist. Can we infer the following from them? Richard is a mechanic.
 From the fact that it is cloudy if and only if it is cold, and that it is not cloudy we can infer that it is not cold. Finally, from the fact that if Richard were a mechanic, then it is cold, and that it is not cold we can infer that Richard is not a mechanic, which contradicts that Richard is a mechanic. Therefore, the answer is no.