What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: U_2(x) <-> U_1(x). exists x: W(x) -> P(x). forall x: ~P(x). forall x: W(x) <-> U_2(x).
exists x: ~W(x). forall x: U_2(x) -> U_1(x). forall x: W(x) -> U_2(x). forall x: U_1(x) -> U_2(x). forall x: U_2(x) -> W(x).