What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, if z drives a car, then z is working. For all z, if z climbs a mountain, then z is curious. There is at least one z for which z will drive a car or z will climb a mountain. For all z, if z were curious, then z is working.
For all z, if z climbs a mountain, then z is working.