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, z_2 is an office clerk if and only if z_2 is an artist. For all z_2, z_2 is an office clerk if and only if z_2 is an artist.
For all z_2, if z_2 were an office clerk, then z_2 is an artist. For all z_2, if z_2 were an office clerk, then z_2 is an artist. For all z_2, if z_2 were an artist, then z_2 is an office clerk. For all z_2, if z_2 were an artist, then z_2 is an office clerk.