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 rich, then x_9 is reading a book. For all x_9, if x_9 goes running, then x_9 is rich. There is at least one x_9 for which x_9 will not read a book. For all x_9, x_9 will go running or x_9 will play tennis.
There is at least one x_9 for which x_9 is not rich can be inferred via the existential modus tollens rule. For all x_9, if x_9 goes running, then x_9 is reading a book can be inferred via the universal transitivity rule.