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 a doctor. For all x_3, if x_3 were an artist, then x_3 is a nurse. For all x_3, x_3 is an artist or x_3 will go running. There is at least one x_3 for which if x_3 goes running, then x_3 is a nurse.
There is at least one x_3 for which x_3 is a nurse.