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: exists x_20: P_12(x_20) -> ~P_20(x_20). forall x_20: P_20(x_20) and Q_20(x_20). forall x_20: P_12(x_20) or T(x_20).
forall x_20: P_20(x_20) can be inferred via the universal simplification rule. forall x_20: Q_20(x_20) can be inferred via the universal simplification rule.