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 for which z is a bartender if and only if z is a server. For all z, z is a politician or z is not a server.
For all z, if z were a server, then z is a politician. There is at least one z for which if z were a bartender, then z is a server. There is at least one z for which if z were a server, then z is a bartender.