Consider the following premises. For all x_6, x_6 is a sailor. For all x_6, x_6 will take a plane or x_6 is not a sailor. For all x_6, if x_6 takes a plane, then x_6 is driving a car. Can we infer the following from them? There is at least one x_6 for which x_6 will not drive a car.
 From the fact that for all x_6, x_6 will take a plane or x_6 is not a sailor we can infer that for all x_6, if x_6 were a sailor, then x_6 is taking a plane. From the fact that for all x_6, if x_6 were a sailor, then x_6 is taking a plane, and that for all x_6, x_6 is a sailor we can infer that for all x_6, x_6 will take a plane. Finally, from the fact that for all x_6, if x_6 takes a plane, then x_6 is driving a car, and that for all x_6, x_6 will take a plane we can infer that for all x_6, x_6 will drive a car, which contradicts that There is at least one x_6 for which x_6 will not drive a car. Therefore, the answer is no.