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\item find the ``pivot vector'', i.e. the first vector
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\item find the ``pivot vector'', i.e. the first vector
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$v_i, \quad 0 \leq i < f$ such that $\alpha_j = 1$. If none is found, go
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$v_i, \quad 0 \leq i < f$ such that $\alpha_j = 1$. If none is found, go
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