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 x_10 for which if x_10 drives a car, then x_10 is a writer. For all x_10, if x_10 drives a car, then x_10 is a writer. For all x_10, x_10 is a writer if and only if x_10 will drive a car.
For all x_10, if x_10 were a writer, then x_10 is driving a car. For all x_10, if x_10 drives a car, then x_10 is a writer.