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: James is reading a book if and only if James is driving a car. For all z_2, if z_2 drives a car, then z_2 is reading a book.
If James reads a book, then James is driving a car can be inferred via the biconditional elimination rule. If James drives a car, then James is reading a book can be inferred via the biconditional elimination rule.