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 will work or x_5 will not play squash. For all x_5, x_5 will not sleep. For all x_5, if x_5 works, then x_5 is sleeping.
For all x_5, x_5 will not work can be inferred via the universal modus tollens rule. For all x_5, if x_5 plays squash, then x_5 is working can be inferred via the universal rewriting rule.