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 y_4, y_4 will read a book and y_4 is a janitor. Robert is cooking.
For all y_4, y_4 will read a book can be inferred via the universal simplification rule. For all y_4, y_4 is a janitor can be inferred via the universal simplification rule.