At room temperature, N,N-dimethylformamide, HCON(CH3)2, has three "H NMR signals, appearing at 2.9, 3.0, and 8.0 ppm. As the temperature is increased, the two signals at 2.9 and 3.0 ppm merge into one signal. Explain. Hint: Consider the resonance structures of the compound.

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