Consider the following premises. For all x_11, x_11 will take a plane if and only if x_11 is a janitor. There is at least one x_11 for which if x_11 drives a car, then x_11 is not a janitor. For all x_11, x_11 is a politician or x_11 will take a plane. For all x_11, x_11 is a politician if and only if x_11 is a janitor. Can we infer the following from them? For all x_11, x_11 will drive a car.
 From the fact that for all x_11, x_11 will take a plane if and only if x_11 is a janitor we can infer that for all x_11, if x_11 takes a plane, then x_11 is a janitor. From the fact that for all x_11, x_11 is a politician if and only if x_11 is a janitor we can infer that for all x_11, if x_11 were a politician, then x_11 is a janitor. From the fact that for all x_11, if x_11 were a politician, then x_11 is a janitor, that for all x_11, if x_11 takes a plane, then x_11 is a janitor, and that for all x_11, x_11 is a politician or x_11 will take a plane we can infer that for all x_11, x_11 is a janitor. Finally, from the fact that there is at least one x_11 for which if x_11 drives a car, then x_11 is not a janitor, and that for all x_11, x_11 is a janitor we can infer that there is at least one x_11 for which x_11 will not drive a car, which contradicts that For all x_11, x_11 will drive a car. Therefore, the answer is no.