What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_2: Q_2(x_2) -> R_2(x_2). forall x_2: R_2(x_2) -> P_2(x_2). forall x_2: P_2(x_2) -> Q_2(x_2). forall x_2: ~P_2(x_2).
forall x_2: ~R_2(x_2). forall x_2: Q_2(x_2) -> P_2(x_2). forall x_2: R_2(x_2) -> Q_2(x_2). forall x_2: P_2(x_2) -> R_2(x_2).