How do I prevent multiple responses (same response) being received?

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I send out a survey form to be completed. When I receive the response back there is sometimes a duplicate row/s created on Smartsheet. I have automation to receive the response via e-mail and it appears that the exact response is being received multiple times. How can I prevent this so that only one response is received per completion of a form per person completing it if I do not know who the contact/person completing it

is.

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