In the following reactions, the total number of oxygen atoms in X and Y is ______
$\mathrm{Na}_2 \mathrm{O}+\mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{X}$
$\mathrm{Cl}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{Y}$
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