E_0 = \begin{pmatrix}     0&0\\     0&0     \end{pmatrix},\quad E_0 = \begin{pmatrix}     0&0\\     0&0     \end{pmatrix}, \quad E_0 = \begin{pmatrix}     0&0\\     0&0     \end{pmatrix}, \quad E_0 = \begin{pmatrix}     0&0\\     0&0     \end{pmatrix}