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_12(x_18) -> P_18(x_18). forall x_18: U_2(x_18). forall x_18: T(x_18) -> T_2(x_18). forall x_18: P_18(x_18) <-> T_2(x_18). exists x_18: T(x_18) or P_12(x_18).
forall x_18: P_18(x_18) -> T_2(x_18). forall x_18: T_2(x_18) -> P_18(x_18).