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NOTES: All purchases final. Please be sure to double-check all information you provide (e.g. mailing address) to ensure proper delivery. Sales tax added to all purchases made within Illinois (except for those made by sales tax exempt organizations). At times, anniversary editions of the books and/or workbooks are released or updates are made in the books (e.g. text is updated and/or reviews are added/removed from the page 1 reviews page, etc). 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 in the page 1 reviews shown on the website.