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 z_3 will play squash if and only if z_3 is a server. For all z_3, z_3 will play squash if and only if z_3 is a server.
For all z_3, if z_3 plays squash, then z_3 is a server. There is at least one z_3 for which if z_3 plays squash, then z_3 is a server. For all z_3, if z_3 were a server, then z_3 is playing squash. There is at least one z_3 for which if z_3 were a server, then z_3 is playing squash.