What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? w <-> ~Q_2(f). ~S(f). forall x_1: S(x_1) <-> Q_2(x_1).
w -> ~Q_2(f). ~Q_2(f) -> w. forall x_1: S(x_1) -> Q_2(x_1). forall x_1: Q_2(x_1) -> S(x_1).