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_9, if x_9 sleeps, then x_9 is rich. For all x_9, x_9 will drive a car or x_9 is not happy. For all x_9, if x_9 drives a car, then x_9 is sleeping. For all x_9, if x_9 were rich, then x_9 is happy.
For all x_9, if x_9 sleeps, then x_9 is happy can be inferred via the universal transitivity rule. For all x_9, if x_9 drives a car, then x_9 is rich can be inferred via the universal transitivity rule. For all x_9, if x_9 were happy, then x_9 is driving a car can be inferred via the universal rewriting rule.