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 sleeps, then x_5 is taking a plane. For all x_5, x_5 will sleep or x_5 will not take a plane.
For all x_5, if x_5 takes a plane, then x_5 is sleeping can be inferred via the universal rewriting rule.