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_14, if x_14 were a cashier, then x_14 is a doctor. For all x_14, x_14 is a cashier. For all x_14, if x_14 were a doctor, then x_14 is an office clerk.
For all x_14, x_14 is a doctor can be inferred via the universal modus ponens rule. For all x_14, if x_14 were a cashier, then x_14 is an office clerk can be inferred via the universal transitivity rule.