What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: U_2(y) <-> W_3(y). exists y: ~W_3(y). forall y: U_2(y) or T(y).
forall y: U_2(y) -> W_3(y). forall y: W_3(y) -> U_2(y). exists y: ~U_2(y).