What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_1, if z_1 were a server, then z_1 is poor. There is at least one z_1 for which z_1 is poor if and only if z_1 is a server.
There is at least one z_1 for which if z_1 were poor, then z_1 is a server. There is at least one z_1 for which if z_1 were a server, then z_1 is poor.