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, y is rich if and only if y will read a book. For all y, y is rich if and only if y will read a book.
For all y, if y were rich, then y is reading a book can be inferred via the universal biconditional elimination rule. For all y, if y were rich, then y is reading a book can be inferred via the universal biconditional elimination rule. For all y, if y reads a book, then y is rich can be inferred via the universal biconditional elimination rule. For all y, if y reads a book, then y is rich can be inferred via the universal biconditional elimination rule.