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_8, x_8 is a scientist or x_8 will not climb a mountain. For all x_8, if x_8 were a lawyer, then x_8 is a scientist. There is at least one x_8 for which x_8 will take a plane. For all x_8, x_8 will climb a mountain or x_8 is a lawyer.
For all x_8, if x_8 climbs a mountain, then x_8 is a scientist can be inferred via the universal rewriting rule.