The number of $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds in $\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7,\left(\mathrm{HPO}_3\right)_3$ and $\mathrm{P}_4 \mathrm{O}_{10}$ are respectively.
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