What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_6, x_6 is a server or x_6 is not an astronaut. For all x_6, if x_6 takes a plane, then x_6 is an astronaut. For all x_6, if x_6 were a server, then x_6 is taking a plane.
For all x_6, if x_6 were a server, then x_6 is an astronaut can be inferred via the universal transitivity rule. For all x_6, if x_6 were an astronaut, then x_6 is a server can be inferred via the universal rewriting rule.