The number of molecules from the following which contain only two lone pair of electrons is $\_\_\_\_$ . $\mathrm{H}_2 \mathrm{O}, \mathrm{N}_2, \mathrm{CO}, \mathrm{XeF}_4, \mathrm{NH}_3, \mathrm{NO}, \mathrm{CO}_2, \mathrm{~F}_2$
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