What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_11: P_11(x_11) <-> U(x_11). forall x_11: P_11(x_11) <-> U(x_11).
forall x_11: P_11(x_11) -> U(x_11). forall x_11: P_11(x_11) -> U(x_11). forall x_11: U(x_11) -> P_11(x_11). forall x_11: U(x_11) -> P_11(x_11).