What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_6: T(x_6) <-> T_1(x_6). forall x_6: P_6(x_6) or ~T(x_6). forall x_6: ~P_6(x_6).
forall x_6: T(x_6) -> P_6(x_6). forall x_6: T(x_6) -> T_1(x_6). forall x_6: T_1(x_6) -> T(x_6).