l} \left[ \left( e_{0},0\right) ,\left( e_{0},0\right) \right] =\left( e_{0},0\right) &  & \left[ \left( e_{0},0\right) ,\left( 0,e_{0}\right) % \right] =\left( 0,e_{0}\right) \\  \left[ \left( e_{0},0\right) ,\left( e_{0},0\right) \right] =\left( e_{0},0\right) &  & \left[ \left( e_{0},0\right) ,\left( 0,e_{0}\right) % \right] =\left( 0,e_{0}\right) \\  \left[ \left( e_{0},0\right) ,\left( e_{0},0\right) \right] =