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Excellent point.

Guess that "нет" may sound like a stronger refusal ("No way! Over my dead body!") than those "childish" reducted forms ("But moooom, I wanna play some more!").

But then again,...

Yes, не-а and не (often with that sound resembling the German Knacklaut in the end of the "е" in both cases, think Hawai'i) are quite often used, especially by children, instead of "нет". Sometimes...