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 goes running, then z is driving a car. For all z, if z drives a car, then z is a nurse. For all z, z will go running if and only if z is a nurse.
For all z, if z goes running, then z is a nurse. For all z, if z goes running, then z is a nurse. For all z, if z were a nurse, then z is running.