Reaction of $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of electrons present in $\mathrm{t}_{2 \mathrm{~g}}$-orbitals of the product is $\_\_\_\_$ .
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