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 not an artist or x_3 is a doctor. For all x_3, if x_3 were a doctor, then x_3 is running. For all x_3, x_3 is an artist. There is at least one x_3 for which if x_3 were a politician, then x_3 is running.
Nothing can be inferred from these premises.