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_3: R_2(x_3) -> R(x_3). forall x_3: P_3(x_3). exists x_3: T(x_3) -> R(x_3). forall x_3: ~P_3(x_3) or R_2(x_3).
Nothing can be inferred from these premises.