What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 is a writer if and only if x_12 will drive a car. If Karen were a writer, then Mary is cooking. If Mary cooks, then Karen is driving a car.
If Karen were a writer, then Karen is driving a car. For all x_12, if x_12 were a writer, then x_12 is driving a car. For all x_12, if x_12 drives a car, then x_12 is a writer.