What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_12: S(x_12). forall x_12: P_12(x_12) and Q_12(x_12). exists x_12: P_12(x_12) -> P_4(x_12).
forall x_12: P_12(x_12). forall x_12: Q_12(x_12).