Consider the following premises. For all x_1, if x_1 takes a plane, then x_1 is driving a car. There is at least one x_1 for which x_1 will take a plane or x_1 is curious. For all x_1, x_1 will not drive a car. Can we infer the following from them? If we can, name the inference rule being used: There is at least one x_1 for which x_1 is curious.
 From the fact that for all x_1, if x_1 takes a plane, then x_1 is driving a car, and that for all x_1, x_1 will not drive a car we can infer that for all x_1, x_1 will not take a plane via universal modus tollens. Finally, from the fact that there is at least one x_1 for which x_1 will take a plane or x_1 is curious, and that for all x_1, x_1 will not take a plane we can infer that there is at least one x_1 for which x_1 is curious via existential disjunctive syllogism. Therefore, the answer is yes.