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<form method="post" action="edition_save.php" class="form" id="save-form"><input type="hidden" name="id" value="<?=$edition->id?>">
 <input type="hidden" name="book_id" value="<?=$edition->book_id?>">
 
 <label>Year:</label>
 <input type="text" name="year" value="<?=htmlspecialchars($edition->year)?>" class="form-control"
 placeholder="Integer number">
 
 <label>ISBN:</label>
 <input type="text" name="isbn" value="<?=htmlspecialchars($edition->isbn)?>" class="form-control"
 placeholder="any string ;-)">
 
 <label>Instances:</label>
 <input type="text" name="instance_count" value="<?=htmlspecialchars($edition->instance_count)?>" class="form-control"
 placeholder="Integer number">
 
 <br>
 <input type="submit" class="btn btn-primary">
 </form>
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