What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_3, z_3 is an office clerk if and only if z_3 is a scientist. For all z_3, z_3 is not an office clerk. For all z_3, z_3 is a scientist or z_3 will drive a car.
For all z_3, if z_3 were an office clerk, then z_3 is a scientist. For all z_3, if z_3 were a scientist, then z_3 is an office clerk. For all z_3, z_3 is not a scientist.