What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_2: ~T(x_2). forall x_2: P_4(x_2) -> T(x_2). forall x_2: T(x_2) -> P_4(x_2). exists x_2: P_4(x_2) or Q_3(x_2).
forall x_2: ~P_4(x_2). forall x_2: P_4(x_2) <-> T(x_2). forall x_2: T(x_2) <-> P_4(x_2).