What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_14, x_14 is a writer or x_14 is an office clerk. For all x_14, x_14 will not drive a car. For all x_14, if x_14 were a writer, then x_14 is driving a car.
For all x_14, x_14 is not a writer can be inferred via the universal modus tollens rule.