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_5, x_5 will sleep. For all x_5, if x_5 reads a book, then x_5 is taking a plane. For all x_5, if x_5 were excited, then x_5 is taking a plane. For all x_5, x_5 will read a book.
For all x_5, x_5 will take a plane can be inferred via the universal modus ponens rule. For all x_5, x_5 will sleep and x_5 will read a book can be inferred via the universal conjunction rule. For all x_5, x_5 will read a book and x_5 will sleep can be inferred via the universal conjunction rule.