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_11, if x_11 plays squash, then x_11 is running. For all x_11, x_11 will play squash or x_11 will not go running. For all x_11, if x_11 plays squash, then x_11 is a police officer. There is at least one x_11 for which x_11 is not a police officer.
There is at least one x_11 for which x_11 will not play squash can be inferred via the existential modus tollens rule. For all x_11, if x_11 goes running, then x_11 is playing squash can be inferred via the universal rewriting rule.