Find the total number of unpaired electrons in the set: $[\mathrm{Fe}(\mathrm{CN}){}_6]{}^{3-}$ (low spin), $[\mathrm{MnCl}{}_4]{}^{2-}$ (tetrahedral, high spin), $[\mathrm{Ni}(\mathrm{CN}){}_4]{}^{2-}$ (square planar) and $[\mathrm{Cr}(\mathrm{NH}{}_3){}_6]{}^{3+}$.

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