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<?phpdefine('IN_CB', true);
 include('include/header.php');
 
 registerImageKey('code', 'BCGisbn');
 
 $characters = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9');
 ?>
 
 <div id="validCharacters">
 <h3>Valid Characters</h3>
 <?php foreach ($characters as $character) { echo getButton($character); } ?>
 </div>
 
 <div id="explanation">
 <h3>Explanation</h3>
 <ul>
 <li>ISBN stands for International Standard Book Number.</li>
 <li>ISBN type is based on EAN-13.</li>
 <li>Previously, all ISBN were in EAN-10 format. EAN-13 uses the same encoding but may contain different data in the ISBN number.</li>
 <li>Composed by a GS1 prefix (for ISBN-13), a group identifier, a publisher code, an item number and a check digit.</li>
 </ul>
 </div>
 
 <?php
 include('include/footer.php');
 ?>
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