What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one z_1 for which if z_1 were a writer, then z_1 is an artist. For all z_1, if z_1 were a writer, then z_1 is an artist. For all z_1, z_1 is a writer or z_1 is not an artist.
For all z_1, if z_1 were an artist, then z_1 is a writer.