= \begin{bmatrix}l_x^2 & l_xl_y & l_xl_z \\ l_xl_y & l_y^2 & l_yl_z \\ l_zl_x & l_zl_y & l_z^2\end{bmatrix} \begin{pmatrix}a_x\\a_y\\a_z\end{pmatrix}
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