)\tau_{(0)}(e_{(0)})\tau' (e_{(0)}h) \\ & =N^0 (\phi\tau_{(0)})(e' )\tau_{(0)}(e_{(0)})\tau' (e_{(0)}h) \\ & =N^0 (\phi\tau_{(0)})(e' )\tau_{(0)}(e_{(0)}h_{(0)}S(h_{(0)}))\tau' (e_{(0)}h_{(0)}) \\ & =N^0 (\phi\tau_{(0)})(e' )\tau_{(0)}(e_{(0)}h_{(0)}