The set of all $\alpha$, for which the vector $\vec{a}=\alpha t \hat{\imath}+6 \hat{\jmath}-3 \hat{k}$ and $\vec{b}=t \hat{\imath}-2 \hat{\jmath}-2 \alpha t \hat{k}$ are inclined at an obtuse angle for all $t \in \mathbb{R}$ is
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