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\text { Provide a basis for span } S \text { if } S=\left\{\left[\begin{array}{cc} 3 & -2 \\ 4 & 9 \\ 5 & -6 \end{array}\right] \cdot\left[\begin{array}{cc} 2 & 3

\\ 5 & 8 \\ 4 & 5 \end{array}\right] \cdot\left[\begin{array}{cc} -1 & 3 \\ 2 & 4 \\ -4 & -3 \end{array}\right] \cdot\left[\begin{array}{cc} 4 & 2 \\ 3 & 5 \\ 2 & 1 \end{array}\right]\right\} \text { . }

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