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, x_5 is a cashier and x_5 is fast. For all x_5, if x_5 works, then x_5 is poor. For all x_5, x_5 will work.
For all x_5, x_5 is poor can be inferred via the universal modus ponens rule. For all x_5, x_5 is a cashier can be inferred via the universal simplification rule. For all x_5, x_5 is fast can be inferred via the universal simplification rule.