Consider the following premises. Robert is a bartender if and only if it is windy. Patricia is not taking a plane. Patricia is taking a plane or it is windy. Can we infer the following from them? If we can, name the inference rule being used: Robert is a bartender.
 From the fact that Patricia is taking a plane or it is windy, and that Patricia is not taking a plane we can infer that it is windy via disjunctive syllogism. From the fact that Robert is a bartender if and only if it is windy we can infer that if it is windy, then Robert is a bartender via biconditional elimination. Finally, from the fact that if it is windy, then Robert is a bartender, and that it is windy we can infer that Robert is a bartender via modus ponens. Therefore, the answer is yes.