What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_2: P_2(x_2) or ~U(x_2). forall x_2: P_1(x_2) -> P_2(x_2). forall x_2: U(x_2) or P_1(x_2).
forall x_2: U(x_2) -> P_2(x_2).