I have a survey that I will be sending out to internet users. I am pushing out an email with a unique ID for each person. They have to enter this to take the survey and once that ID is used they will not be able to enter it a second time. However, if someone simply changes the last number then it will allow them to enter another survey.
How do I create a formula that only allows the users to input an ID that come from a prepoulated list?
I do not want someone to be able to submit more than one survey and it has to be anonymous for the people analysis the results which is why I am using an ID number instead of their email addy.
Thanks_
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