What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x_11: P_11(x_11) -> Q_11(x_11). forall x_11: T(x_11) -> ~Q_5(x_11). exists x_11: ~Q_11(x_11). forall x_11: P_11(x_11) or Q_5(x_11).
exists x_11: ~P_11(x_11) can be inferred via the existential modus tollens rule.