What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_16: S_4(x_16) <-> S_16(x_16). S_16(a_16). forall x_25: P_25(x_25).
exists x: S_16(x). forall x_16: S_4(x_16) -> S_16(x_16). forall x_16: S_16(x_16) -> S_4(x_16).