What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If William reads a book, then Karen is driving a car. For all y_2, if y_2 takes a plane, then y_2 is driving a car. For all y_2, if y_2 drives a car, then y_2 is taking a plane.
For all y_2, y_2 will take a plane if and only if y_2 will drive a car. For all y_2, y_2 will drive a car if and only if y_2 will take a plane.