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_3, x_3 is not curious. For all x_3, x_3 is curious or x_3 is a janitor.
For all x_3, x_3 is a janitor can be inferred via the universal disjunctive syllogism rule.