Amongst the following, the number of species having the linear shape is ____.
$\mathrm{XeF}_2, \mathrm{I}_3^{+}, \mathrm{C}_3 \mathrm{O}_2, \mathrm{I}_3^{-}, \mathrm{CO}_2, \mathrm{SO}_2, \mathrm{BeCl}$ and $\mathrm{BCl}_2^{\ominus}$
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