What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, z will work or z is not a poet. For all z, if z were an office clerk, then z is a poet. For all z, z is an office clerk if and only if z will listen to a song.
For all z, if z were a poet, then z is working. For all z, if z were an office clerk, then z is listening to a song. For all z, if z listens to a song, then z is an office clerk.