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_6, x_6 is rich or x_6 will sleep. For all x_6, if x_6 sleeps, then x_6 is an electrician. For all x_6, x_6 is not rich.
For all x_6, x_6 will sleep can be inferred via the universal disjunctive syllogism rule.