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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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closed as unclear what you're asking by Al E., jonsca Nov 2 '14 at 2:19

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

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 '14 at 21:24