What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_1: P(x_1) -> Q_3(x_1). forall x_1: S(x_1) <-> P(x_1). exists x_1: Q_3(x_1) -> S(x_1).
exists x_1: P(x_1) -> S(x_1). forall x_1: S(x_1) -> P(x_1). forall x_1: P(x_1) -> S(x_1).