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_4, x_4 will read a book and x_4 will play squash. For all x_4, x_4 will play tennis.
For all x_4, x_4 will read a book can be inferred via the universal simplification rule. For all x_4, x_4 will play squash can be inferred via the universal simplification rule.