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[\begin{matrix} 2 & 1 \end{matrix}]

[\begin{matrix} \begin{matrix} 1 & - 2 & 0 \end{matrix} \\ \begin{matrix} 4 & 5 & - 3 \end{matrix} \end{matrix}]

[\begin{matrix} 1 & - 3 & 6 \end{matrix}]

[\begin{matrix} - 3 & 6 & 1 \end{matrix}]

[\begin{matrix} 6 & - 3 & 1 \end{matrix}]

[\begin{matrix} 6 & 1 & - 3 \end{matrix}]

ANS : 4

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