What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_4: U(x_4) -> U_2(x_4). forall x_4: U_2(x_4) -> W_1(x_4). forall x_4: W_1(x_4) <-> P_4(x_4).
exists x_4: U(x_4) -> W_1(x_4). forall x_4: W_1(x_4) -> P_4(x_4). forall x_4: P_4(x_4) -> W_1(x_4).