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_16, if x_16 were excited, then x_16 is a janitor. For all x_16, x_16 is rich. There is at least one x_16 for which if x_16 were a cashier, then x_16 is not a janitor. For all x_16, x_16 is excited if and only if x_16 will go running. For all x_16, if x_16 were rich, then x_16 is running.
For all x_16, x_16 will go running can be inferred via the universal modus ponens rule. For all x_16, if x_16 were excited, then x_16 is running can be inferred via the universal biconditional elimination rule. For all x_16, if x_16 goes running, then x_16 is excited can be inferred via the universal biconditional elimination rule.