What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_1: ~T(x_1). exists x_1: U(x_1) or W_1(x_1). forall x_1: T(x_1) <-> U(x_1).
forall x_1: T(x_1) -> U(x_1). forall x_1: U(x_1) -> T(x_1). forall x_1: ~U(x_1).