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_13, x_13 will drive a car or x_13 is a janitor. There is at least one x_13 for which x_13 is an artist. For all x_13, x_13 will not drive a car.
For all x_13, x_13 is a janitor can be inferred via the universal disjunctive syllogism rule.