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The values of k for which $|k \vec{a}| < |\vec{a}|$ and $k \vec{a}+\frac{1}{2} \vec{a}$ is parallel to $\vec{a}$ holds true are
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$\mathrm{k} \in]-1,1\left[\mathrm{k} \neq-\frac{1}{2}\right.$
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