What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: ~Q_1(x). forall x: W_4(x) <-> Q_1(x). exists x: Q(x) <-> W_4(x).
forall x: W_4(x) -> Q_1(x). exists x: Q(x) -> W_4(x). forall x: Q_1(x) -> W_4(x). exists x: W_4(x) -> Q(x). forall x: ~W_4(x).