Consider the following premises. It is windy if and only if Barbara is sad. If Barbara were sad, then Charles is an office clerk. It is snowing or it is windy. Charles is not an office clerk. Can we infer the following from them? If we can, name the inference rule being used: It is snowing.
 From the fact that if Barbara were sad, then Charles is an office clerk, and that Charles is not an office clerk we can infer that Barbara is not sad via modus tollens. From the fact that it is windy if and only if Barbara is sad, and that Barbara is not sad we can infer that it is not windy via biconditional elimination. From the fact that it is snowing or it is windy we can infer that if it is not windy, then it is snowing via rewriting. Finally, from the fact that if it is not windy, then it is snowing, and that it is not windy we can infer that it is snowing via modus ponens. Therefore, the answer is yes.