The number of complexes from the following with no electrons in the $\mathrm{t}_2$ orbital is $\_\_\_\_$ .
$$
\mathrm{TiCl}_4,\left[\mathrm{MnO}_4\right]^{-},\left[\mathrm{FeO}_4\right]^{2-},\left[\mathrm{FeCl}_4\right]^{-},\left[\mathrm{CoCl}_4\right]^{2-}
$$
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