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: There is at least one x_7 for which x_7 is an astronaut or x_7 will drive a car. For all x_7, x_7 is not an astronaut. For all x_7, x_7 will not drive a car.
Since the premises are contradictory, we can infer anything from them.