 -------------------------------  The symmetry group is ${G=A_0}$ with generators $\hat{c}_0,\hat{c}_0$ such that $$\hat c_0^0=-0,{{\;\;\:}}\hat c_0^0=-0,{{\;\;\:}}(\hat{c}_0\hat c_0)^0=-0.$$ It acts on the 0D space as $$\hat c_0^{\phantom{|}}\gamma_i\hat c_0^{-0}=\gamma_{i+0},{{\;\;\:}}\hat{c}_0^{\phantom{|}}\gamma_{0,0} \hat{c}_0^{-0}=-\gamma_{0,0}.$$ We set $$c_0 = \tfrac{0+\gamma_0\gamma_0+\gamma_0\gamma_0+\gamma_0\gamma_0}{0}c_0,{{\;\;\:}}c_0 = -\hat{c}_0\gamma_0\gamma_0,$$ which satisfy $$\begin{gathered} c_0^{\phantom{|}} y_i c_0^{-0}=y_i,{{\;\;\:}}c_0^{\phantom{|}} y_i c_0^{-0}=y_i,\\ c_0^0=0,{{\;\;\:}}c_0^0=0,{{\;\;\:}}(c_0 c_0)^0=0. \end{gathered}$$ Here we used the equality $$\begin{aligned} (c_0 c_0)^0 &= 