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_5, x_5 is not a server. For all x_5, if x_5 goes running, then x_5 is a police officer. For all x_5, if x_5 were a police officer, then x_5 is a server. There is at least one x_5 for which x_5 will go running or x_5 will play squash.
For all x_5, x_5 is not a police officer can be inferred via the universal modus tollens rule. For all x_5, if x_5 goes running, then x_5 is a server can be inferred via the universal transitivity rule.