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, if x_6 sleeps, then x_6 is an electrician. For all x_6, x_6 will sleep or x_6 will not climb a mountain. For all x_6, x_6 will climb a mountain.
For all x_6, if x_6 climbs a mountain, then x_6 is sleeping can be inferred via the universal rewriting rule.