Consider the following premises. If it is windy, then Sarah is taking a plane. If Robert were an office clerk, then John is writing a letter. Sarah is not taking a plane. If it is cloudy, then John is writing a letter. It is cloudy or Robert is an office clerk. Can we infer the following from them? If we can, name the inference rule being used: It is windy.
 From the fact that if it is cloudy, then John is writing a letter, that if Robert were an office clerk, then John is writing a letter, and that it is cloudy or Robert is an office clerk we can infer that John is writing a letter via disjunction elimination. Finally, from the fact that if it is windy, then Sarah is taking a plane, and that Sarah is not taking a plane we can infer that it is not windy via modus tollens, which contradicts that It is windy. Therefore, the answer is no.