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, if x_5 were a police officer, then x_5 is sleeping. For all x_5, x_5 is a police officer or x_5 is rich. For all x_5, if x_5 were rich, then x_5 is sleeping.
For all x_5, x_5 will sleep can be inferred via the universal disjunction elimination rule.