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_2: ~U(x_2) or R(x_2). forall x_2: P_2(x_2) or U(x_2). forall x_2: ~P_2(x_2) or R_2(x_2).
forall x_2: U(x_2) or R_2(x_2) can be inferred via the universal resolution rule.