What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_18: T_3(x_18) or Q_3(x_18). forall x_18: T_3(x_18) -> P_18(x_18). forall x_18: P_4(x_18). exists x_18: ~P_18(x_18). forall x_18: P_18(x_18) -> T_3(x_18).
exists x_18: ~T_3(x_18). forall x_18: T_3(x_18) <-> P_18(x_18). forall x_18: P_18(x_18) <-> T_3(x_18).