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N O_{2}

N {O_{2}}^{-}

N {O_{2}}^{+}

N {O_{2}}^{+}

N O_{2}

N {O_{2}}^{-}

N {O_{2}}^{-}

N {O_{2}}^{-}

N O_{2}

N O_{2} -

N {O_{2}}^{-}

N {O_{2}}^{+}

ANS : 4

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