 \\ \mathfrak{h}_{-} &=&\mathfrak{g}_{-}\oplus \mathfrak{g}_{-}^{\bot }=Lspan\left\{ \left( e_{0},0\right) ,\left( e_{0},0\right) ,\left( e_{0},0\right) ,\left( 0,e_{0}\right) ,\left( 0,e_{0}\right) \left( 0,e_{0}\right) \right\}