Consider the following premises. Charles is not driving a car. Charles is working or it is windy. For all x_8, if x_8 works, then x_8 is driving a car. For all x_8, if x_8 drives a car, then x_8 is working. Can we infer the following from them? If we can, name the inference rule being used: It is windy.
 From the fact that for all x_8, if x_8 drives a car, then x_8 is working, and that for all x_8, if x_8 works, then x_8 is driving a car we can infer that for all x_8, x_8 will drive a car if and only if x_8 will work via universal biconditional introduction. From the fact that for all x_8, x_8 will drive a car if and only if x_8 will work we can infer that Charles is driving a car if and only if Charles is working via universal instantiation. From the fact that Charles is driving a car if and only if Charles is working, and that Charles is not driving a car we can infer that Charles is not working via biconditional elimination. Finally, from the fact that Charles is working or it is windy, and that Charles is not working we can infer that it is windy via disjunctive syllogism. Therefore, the answer is yes.