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 take a plane. For all x_7, x_7 will not drink water. For all x_7, if x_7 takes a plane, then x_7 is drinking water.
For all x_7, x_7 will not take a plane. For all x_7, if x_7 were a server, then x_7 is taking a plane. For all x_7, if x_7 takes a plane, then x_7 is a server.