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# The formal changes of $N_{(1)}, N_{(2)}$ and $O$ atoms in : $\ddot{N_{(1)}} =\ddot{N_{(2)}} = \ddot {O} :$ are respectively :

$\begin {array} {1 1} (1)\;+1, -1, 0 & \quad (2)\;-1, +1, 0 \\ (3)\;+1,+1, 0 & \quad (4)\;-1,-1,0 \end {array}$