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_3 for which if z_3 were a politician, then z_3 is sad. For all z_3, if z_3 were sad, then z_3 is a poet. For all z_3, z_3 is not a poet. For all z_3, if z_3 were a musician, then z_3 is a politician.
For all z_3, z_3 is not sad. There is at least one z_3 for which if z_3 were a politician, then z_3 is a poet. There is at least one z_3 for which if z_3 were a musician, then z_3 is sad.