Among $\mathrm{ClF}{}_3$, $\mathrm{BrF}{}_3$, $\mathrm{IF}{}_5$, $\mathrm{ICl}{}_4{}^{-}$, $\mathrm{BrF}{}_5$, $\mathrm{I}{}_3{}^{-}$ and $\mathrm{ICl}{}_2{}^{-}$, the number of species having exactly two lone pairs on the central atom is

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