What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one z for which z is a poet if and only if z will drive a car. For all z, z is a poet if and only if z will drive a car.
For all z, if z were a poet, then z is driving a car. There is at least one z for which if z were a poet, then z is driving a car. For all z, if z drives a car, then z is a poet. There is at least one z for which if z drives a car, then z is a poet.