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$\displaystyle \qquad\qquad \begin{pmatrix}72 56 \...
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$\displaystyle \qquad\qquad \begin{pmatrix}56 16 \...
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$\displaystyle 0 \qquad\qquad$" |
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$\displaystyle \qquad\qquad \begin{pmatrix}16 8 \e...
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