What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_2, if z_2 were rich, then z_2 is climbing a mountain. For all z_2, if z_2 were an astronaut, then z_2 is rich. For all z_2, if z_2 climbs a mountain, then z_2 is an astronaut.
For all z_2, if z_2 were rich, then z_2 is an astronaut. For all z_2, if z_2 were an astronaut, then z_2 is climbing a mountain. For all z_2, if z_2 climbs a mountain, then z_2 is rich.