The number of species from the following that have pyramidal geometry around the central atom is $\_\_\_\_$
$
\mathrm{S}_2 \mathrm{O}_3^{2-}, \mathrm{SO}_4^{2-}, \mathrm{SO}_3^{2-}, \mathrm{S}_2 \mathrm{O}_7^{2-}
$
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