What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: W_1(x_9) -> S(x_9). forall x_9: S(x_9) -> W_1(x_9). forall x_9: ~Q_7(x_9). exists x_9: W_1(x_9) <-> Q_7(x_9).
forall x_9: W_1(x_9) <-> S(x_9). forall x_9: S(x_9) <-> W_1(x_9). exists x_9: W_1(x_9) -> Q_7(x_9). exists x_9: Q_7(x_9) -> W_1(x_9). exists x_9: ~W_1(x_9).