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 climbs a mountain, then z is drinking water. There is at least one z for which if z were a doctor, then z is climbing a mountain. For all z, if z drinks water, then z is a doctor.
For all z, if z climbs a mountain, then z is a doctor. There is at least one z for which if z were a doctor, then z is drinking water. There is at least one z for which if z drinks water, then z is climbing a mountain.