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 were a janitor, then x_9 is sleeping. For all x_9, if x_9 sleeps, then x_9 is reading a book. There is at least one x_9 for which if x_9 drives a car, then x_9 is a politician. For all x_9, x_9 will drive a car or x_9 will make tea. For all x_9, if x_9 reads a book, then x_9 is a politician. For all x_9, if x_9 makes tea, then x_9 is a janitor.
For all x_9, if x_9 were a janitor, then x_9 is reading a book can be inferred via the universal transitivity rule. For all x_9, if x_9 sleeps, then x_9 is a politician can be inferred via the universal transitivity rule. For all x_9, if x_9 makes tea, then x_9 is sleeping can be inferred via the universal transitivity rule.