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_8, if x_8 were an artist, then x_8 is fast. There is at least one x_8 for which if x_8 were a nurse, then x_8 is rich. For all x_8, if x_8 takes a plane, then x_8 is fast. For all x_8, if x_8 were rich, then x_8 is not fast. For all x_8, x_8 is an artist or x_8 will take a plane.
For all x_8, x_8 is fast can be inferred via the universal disjunction elimination rule.