The number of paramagnetic metal complex species among [ Co ( NH_3)_6]^3+,[ Co ( C_2 O_4)_3]^3-, [ MnCl_6]^3-,[ Mn ( CN )_6]^3-,[ CoF_6]^3-,[ Fe ( CN…

The number of paramagnetic metal complex species among $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+},\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$, $\displaystyle \left[\mathrm{MnCl}_6\right]^{3-},\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ and $\displaystyle \left[\mathrm{FeF}_6\right]^{3-}$ with same number of unpaired electrons is $\displaystyle \_\_\_\_$.