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