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) or R_18(x_18). forall x_18: S(x_18). forall x_18: P_18(x_18) or Q_18(x_18). exists x_18: Q_18(x_18) <-> T(x_18). forall x_18: R_18(x_18) -> T(x_18).
forall x_18: Q_18(x_18) or R_18(x_18). exists x_18: Q_18(x_18) -> T(x_18). exists x_18: T(x_18) -> Q_18(x_18).