The coordination numbers of Co and Al in $\left[\mathrm{Co}(\mathrm{Cl})(\mathrm{en})_2\right] \mathrm{Cl}$ and $\mathrm{K}_3\left[\mathrm{Al}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]$, respectively, are (en $=$ ethane -1 , 2-diamine)
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