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: There is at least one x_1 for which x_1 will take a plane. For all x_1, if x_1 reads a book, then x_1 is driving a car. For all x_1, x_1 will read a book.
For all x_1, x_1 will drive a car can be inferred via the universal modus ponens rule. There is at least one x_1 for which x_1 will take a plane and x_1 will read a book can be inferred via the existential conjunction rule. There is at least one x_1 for which x_1 will read a book and x_1 will take a plane can be inferred via the existential conjunction rule.