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_15, x_15 is an astronaut or x_15 is not a lawyer. For all x_15, x_15 is a lawyer.
For all x_15, if x_15 were a lawyer, then x_15 is an astronaut can be inferred via the universal rewriting rule.