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857e4c81be216f2c3706262110ba0eeab8b9ece2: $$
\begin{pmatrix} a_{11} & a_{12} & \dots & a_{1n} \ a_{12} & a_{12} & \dots & a_{2n} \ \vdots & \vdots & \ddots & \vdots \ a_{1n} & a_{2n} & \dots & a_{nn} \end{pmatrix}