What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, z will play squash or z is excited. For all z, if z plays squash, then z is a server. For all z, z will not sleep. For all z, z is a server or z is not excited. There is at least one z for which z will sleep or z is a taxi driver.
There is at least one z for which z is a taxi driver. For all z, if z were excited, then z is a server.