What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_4: Q(x_4) -> W(x_4). forall x_4: W(x_4) -> Q(x_4). forall x_4: W(x_4) -> Q(x_4).
forall x_4: Q(x_4) <-> W(x_4). forall x_4: Q(x_4) <-> W(x_4). forall x_4: W(x_4) <-> Q(x_4). forall x_4: W(x_4) <-> Q(x_4).