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: forall y: S(y) -> Q_3(y). forall y: W(y) -> U(y). forall y: U(y) <-> S(y).
forall y: U(y) -> S(y) can be inferred via the universal biconditional elimination rule. forall y: S(y) -> U(y) can be inferred via the universal biconditional elimination rule.