Consider the following premises. Mary is not a server. Richard is making tea. If Mary drives a car, then Mary is a server. If Mary were a server, then Mary is driving a car. Can we infer the following from them? If we can, name the inference rule being used: Richard is making tea and Mary is not driving a car.
 From the fact that if Mary drives a car, then Mary is a server, and that if Mary were a server, then Mary is driving a car we can infer that Mary is driving a car if and only if Mary is a server via biconditional introduction. From the fact that Mary is driving a car if and only if Mary is a server, and that Mary is not a server we can infer that Mary is not driving a car via biconditional elimination. Finally, from the fact that Richard is making tea, and that Mary is not driving a car we can infer that Richard is making tea and Mary is not driving a car via conjunction. Therefore, the answer is yes.