What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_6: W(x_6) -> P_5(x_6). forall x_6: U_1(x_6) -> P_5(x_6). forall x_6: P_5(x_6) -> W(x_6). exists x_6: U_1(x_6).
exists x_6: P_5(x_6). forall x_6: U_1(x_6) -> W(x_6). forall x_6: W(x_6) <-> P_5(x_6). forall x_6: P_5(x_6) <-> W(x_6).