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_5, if x_5 were a server, then x_5 is making tea. For all x_5, if x_5 were fast, then x_5 is a server. For all x_5, x_5 will take a plane or x_5 is fast. For all x_5, if x_5 takes a plane, then x_5 is an astronaut. For all x_5, if x_5 makes tea, then x_5 is an astronaut.
For all x_5, if x_5 were a server, then x_5 is an astronaut can be inferred via the universal transitivity rule. For all x_5, if x_5 were fast, then x_5 is making tea can be inferred via the universal transitivity rule.