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