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 an office clerk, then z is working. For all z, z is not an artist. There is at least one z for which if z works, then z is an office clerk. For all z, z is an artist if and only if z will work.
There is at least one z for which z will work if and only if z is an office clerk. There is at least one z for which z is an office clerk if and only if z will work. For all z, if z were an artist, then z is working. For all z, if z works, then z is an artist. For all z, z will not work.