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 plays tennis, then z_1 is a bartender. There is at least one z_1 for which z_1 will play tennis if and only if z_1 is a server. For all z_1, if z_1 plays tennis, then z_1 is sleeping. For all z_1, if z_1 sleeps, then z_1 is a server.
For all z_1, if z_1 plays tennis, then z_1 is a server. There is at least one z_1 for which if z_1 plays tennis, 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 playing tennis.