What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_13: Q_13(x_13) -> S(x_13). forall x_13: P_13(x_13) -> S(x_13). forall x_13: P_13(x_13) or Q_13(x_13). exists x_13: W(x_13) -> Q(x_13). forall x_13: W(x_13).
exists x_13: Q(x_13). forall x_13: S(x_13).