What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_7: U(x_7) <-> U_2(x_7). forall x_7: U(x_7). exists x_7: U_1(x_7).
exists x_7: U_1(x_7) and U(x_7). exists x_7: U(x_7) and U_1(x_7). forall x_7: U(x_7) -> U_2(x_7). forall x_7: U_2(x_7) -> U(x_7).