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_13, x_13 will drive a car. For all x_13, x_13 will sleep or x_13 will read a book. There is at least one x_13 for which if x_13 drives a car, then x_13 is an astronaut. For all x_13, if x_13 sleeps, then x_13 is playing tennis. For all x_13, if x_13 reads a book, then x_13 is playing tennis.
There is at least one x_13 for which x_13 is an astronaut can be inferred via the existential modus ponens rule. For all x_13, x_13 will play tennis can be inferred via the universal disjunction elimination rule.