Consider the following premises. There is at least one x_11 for which x_11 will drive a car if and only if x_11 will take a plane. For all x_11, x_11 will take a plane if and only if x_11 will work. For all x_11, x_11 is a lawyer if and only if x_11 will work. For all x_11, x_11 is not a lawyer. Can we infer the following from them? There is at least one x_11 for which x_11 will not drive a car.
 From the fact that for all x_11, x_11 will take a plane if and only if x_11 will work we can infer that for all x_11, if x_11 takes a plane, then x_11 is working. From the fact that for all x_11, x_11 is a lawyer if and only if x_11 will work, and that for all x_11, x_11 is not a lawyer we can infer that for all x_11, x_11 will not work. From the fact that for all x_11, if x_11 takes a plane, then x_11 is working, and that for all x_11, x_11 will not work we can infer that for all x_11, x_11 will not take a plane. Finally, from the fact that there is at least one x_11 for which x_11 will drive a car if and only if x_11 will take a plane, and that for all x_11, x_11 will not take a plane we can infer that there is at least one x_11 for which x_11 will not drive a car. Therefore, the answer is yes.