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 an artist. For all x_9, x_9 will read a book or x_9 is not a janitor. For all x_9, if x_9 were an artist, then x_9 is a janitor.
For all x_9, if x_9 reads a book, then x_9 is a janitor can be inferred via the universal transitivity rule. For all x_9, if x_9 were a janitor, then x_9 is reading a book can be inferred via the universal rewriting rule.