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 rich, then x_5 is an astronaut. For all x_5, if x_5 were a bartender, then x_5 is an astronaut. For all x_5, x_5 is a bartender and x_5 is an artist.
For all x_5, x_5 is a bartender can be inferred via the universal simplification rule. For all x_5, x_5 is an artist can be inferred via the universal simplification rule.