What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, x_4 will not work or x_4 is a nurse. For all x_4, if x_4 climbs a mountain, then x_4 is a doctor. For all x_4, x_4 is not a doctor. There is at least one x_4 for which x_4 will work or x_4 will climb a mountain.
For all x_4, x_4 will not climb a mountain. There is at least one x_4 for which x_4 will climb a mountain or x_4 is a nurse.