What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 is a server if and only if x_7 will make tea. For all x_7, x_7 is an astronaut if and only if x_7 is a server. For all x_7, x_7 is not an astronaut.
For all x_7, if x_7 were a server, then x_7 is making tea. For all x_7, if x_7 were an astronaut, then x_7 is a server. For all x_7, if x_7 makes tea, then x_7 is a server. For all x_7, if x_7 were a server, then x_7 is an astronaut. For all x_7, x_7 is not a server.