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, if x_3 goes running, then x_3 is climbing a mountain. There is at least one x_3 for which if x_3 climbs a mountain, then x_3 is not a doctor. For all x_3, x_3 is a doctor.
There is at least one x_3 for which x_3 will not climb a mountain.