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 reads a book, then x_9 is playing a game. For all x_9, if x_9 drives a car, then x_9 is drinking water. For all x_9, x_9 is a lawyer or x_9 is a janitor. There is at least one x_9 for which if x_9 were a lawyer, then x_9 is drinking water. For all x_9, if x_9 plays a game, then x_9 is driving a car. For all x_9, if x_9 were a janitor, then x_9 is reading a book.
For all x_9, if x_9 reads a book, then x_9 is driving a car can be inferred via the universal transitivity rule. For all x_9, if x_9 plays a game, then x_9 is drinking water can be inferred via the universal transitivity rule. For all x_9, if x_9 were a janitor, then x_9 is playing a game can be inferred via the universal transitivity rule.