What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_1: P(x_1) <-> U_3(x_1). exists x_1: U_3(x_1) -> P(x_1). forall x_1: T_4(x_1) <-> U_3(x_1).
forall x_1: P(x_1) -> U_3(x_1). forall x_1: T_4(x_1) -> U_3(x_1). forall x_1: U_3(x_1) -> P(x_1). forall x_1: U_3(x_1) -> T_4(x_1).