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This  This is an example of a cross-over crossover study where testing 7 smokeless tobacco products were tested. All product products contain nicotine except for product F, which was a nicotine-/tobacco-free product. Subject Each subject first used the product ad libitum and then ; the next day, the product usage was evaluated in the morning, as specified in the protocol in the morning. The subjects Subjects were confined to the site. Product Products were supplied to the subject subjects as needed by site staff.   The sponsor  Each usage was recorded. The applicant did not submit a Product Accountability ( DA ) domain, or the nor an EC domain.   The name of the actual product was not would be used, but a dummy name is used in the this example below.