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All purchases are final. Please be sure to double-check all information provided (ie mailing address) for proper delivery. Sales tax added to all purchases made within Illinois. At times, in the books and workbooks, updates are made (reviews are added/removed from the page 1 reviews page, for example). So, the version of the book or workbook received by the buyer may, for instance, have a different set of page 1 reviews on the first page than those seen on this website.