What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_7: ~Q_6(x_7). forall x_7: S_1(x_7) <-> Q_6(x_7). forall x_7: ~P_7(x_7) or R_2(x_7). forall x_7: P_7(x_7).
forall x_7: S_1(x_7) -> Q_6(x_7). forall x_7: Q_6(x_7) -> S_1(x_7). forall x_7: ~S_1(x_7).