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Is there any quick way to ensure that each user filled the form just once?

I've already seen this question: Limiting the amount of Google doc's forms that can be submitted . But it doesn't answer my question.

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If still interested, what do you mean by "a" user? Do you want to stop well-intentioned inadvertent duplication (ie say trust a submitted name) or are you also trying to prevent multiple returns from a person not inclined to disclose their forms are from a single individual? And by "filled the form just once" would you accept capturing duplicates after submission? –  pnuts Jul 4 at 21:24

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