What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_3, x_3 is an astronaut. For all x_3, x_3 is not an artist. There is at least one x_3 for which if x_3 were an astronaut, then x_3 is an artist.
Since the premises are contradictory, we can infer anything from them.