What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, y will take a plane if and only if y will sleep. For all y, if y sleeps, then y is taking a plane. There is at least one y for which y will drive a car. For all y, y will take a plane.
There is at least one y for which y will drive a car and y will take a plane. There is at least one y for which y will take a plane and y will drive a car. For all y, if y takes a plane, then y is sleeping. For all y, if y sleeps, then y is taking a plane.