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Turbo
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An example matrix

We have $Det(M)=(a+b)(c+d)$ where $M=\begin{bmatrix} a& 0& -1& 0\\ 0& c& 0& -1\\ b& 0& 1& 0\\ 0& d& 0& 1 \end{bmatrix}$.

Is there a matrix with $a,b,c,d,a',b',c',d',\pm1,0$ as entries that gives $(a+b)(c+d)+(a'+b')(c'+d')$ (if needed we can use other $\Bbb Z$ entries but I would prefer not)?

Turbo
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