What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: P_1(x) or W_1(x). forall x: P_1(x) -> W(x). forall x: W_1(x) -> U(x). exists x: U_3(x) -> ~U(x). forall x: W(x) -> U(x).
forall x: P_1(x) -> U(x).