What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_18: P_18(x_18). forall x_25: P_25(x_25) <-> R_2(x_25). forall x_25: P_25(x_25).
forall x_25: P_25(x_25) -> R_2(x_25). forall x_25: R_2(x_25) -> P_25(x_25).