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_2, x_2 is a soldier or x_2 is an astronaut. For all x_2, if x_2 were an astronaut, then x_2 is an office clerk. For all x_2, x_2 is an office clerk or x_2 is not a soldier.
For all x_2, if x_2 were a soldier, then x_2 is an office clerk can be inferred via the universal rewriting rule.