Consider the following premises. For all z_4, z_4 is a scientist if and only if z_4 is rich. For all z_4, if z_4 drives a car, then z_4 is rich. For all z_4, z_4 is a poet if and only if z_4 will drive a car. For all z_4, z_4 is not a scientist. Can we infer the following from them? There is at least one z_4 for which z_4 is a poet.
 From the fact that for all z_4, z_4 is a scientist if and only if z_4 is rich, and that for all z_4, z_4 is not a scientist we can infer that for all z_4, z_4 is not rich. From the fact that for all z_4, if z_4 drives a car, then z_4 is rich, and that for all z_4, z_4 is not rich we can infer that for all z_4, z_4 will not drive a car. Finally, from the fact that for all z_4, z_4 is a poet if and only if z_4 will drive a car, and that for all z_4, z_4 will not drive a car we can infer that for all z_4, z_4 is not a poet, which contradicts that There is at least one z_4 for which z_4 is a poet. Therefore, the answer is no.