What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_13: S_1(x_13) -> S(x_13). exists x_13: S(x_13) -> S_1(x_13). forall x_13: S_1(x_13) -> S(x_13). forall x_13: Q_2(x_13). forall x_13: S_1(x_13) -> ~Q_2(x_13).
forall x_13: ~S_1(x_13). exists x_13: S(x_13) <-> S_1(x_13). exists x_13: S(x_13) <-> S_1(x_13). exists x_13: S_1(x_13) <-> S(x_13). exists x_13: S_1(x_13) <-> S(x_13).