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_2: ~R_4(x_2). forall x_2: P(x_2) -> R_2(x_2). forall x_2: R_2(x_2) -> R_4(x_2). P(a_5) or t.
forall x_2: ~R_2(x_2) can be inferred via the universal modus tollens rule. forall x_2: P(x_2) -> R_4(x_2) can be inferred via the universal transitivity rule.