What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, if y plays squash, then y is driving a car. For all y, if y takes a plane, then y is playing squash. There is at least one y for which if y drives a car, then y is taking a plane. For all y, y will not take a plane.
There is at least one y for which y will not drive a car. For all y, if y takes a plane, then y is driving a car. There is at least one y for which if y drives a car, then y is playing squash. There is at least one y for which if y plays squash, then y is taking a plane.