What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_10: ~R_10(x_10). forall x_13: S_4(x_13) -> Q_13(x_13). Q_13(a_12) -> R_10(a_10). forall x_13: Q_13(x_13) -> S_4(x_13).
forall x_13: S_4(x_13) <-> Q_13(x_13). forall x_13: Q_13(x_13) <-> S_4(x_13).