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 were a nurse, then z is drinking water. For all z, if z drinks water, then z is taking a plane. For all z, z is a nurse or z will not take a plane.
For all z, if z were a nurse, then z is taking a plane. For all z, if z takes a plane, then z is a nurse.