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Modify the prototype form page so that when the JavaScript function has verified that all of the required fields have been filled, a cookie is added...

Modify the prototype form page so that when the JavaScript function has verified that all of the required fields have been filled, a cookie is added to the user's computer. If the same user attempts to fill out the form a second time, the user will be directed to a separate HTML page advising them that they have already submitted the form.

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