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_4, if x_4 drives a car, then x_4 is working. For all x_4, if x_4 works, then x_4 is a cashier. For all x_4, if x_4 were a cashier, then x_4 is driving a car.
For all x_4, if x_4 drives a car, then x_4 is a cashier can be inferred via the universal transitivity rule. For all x_4, if x_4 works, then x_4 is driving a car can be inferred via the universal transitivity rule. For all x_4, if x_4 were a cashier, then x_4 is working can be inferred via the universal transitivity rule.