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\text { 25. } S=\left\{\left[\begin{array}{r} 1 \\ -2 \\ 2 \end{array}\right], \quad\left[\begin{array}{l} 0 \\ 1 \\ 1 \end{array}\right], \quad\left[\begin{array}{l} 2 \\ 0 \\ 8 \end{array}\right]\right\} ; \quad \mathbf{b}=\left[\begin{array}{r} -5 \\

11 \\ -7 \end{array}\right]

Fig: 1