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_3, x_3 is a poet or x_3 is not an astronaut. For all x_3, if x_3 were a poet, then x_3 is an astronaut.
For all x_3, if x_3 were an astronaut, then x_3 is a poet can be inferred via the universal rewriting rule.