public static function run($dataDir = null)
 {
     # Instantiating a Workbook object
     $workbook = new Workbook();
     # Adding Page Breaks
     ManagingPageBreaks::add_page_breaks($dataDir = null, $workbook);
     # Clearing All Page Breaks
     ManagingPageBreaks::clear_all_page_breaks($dataDir = null, $workbook);
     # Removing Specific Page Break
     ManagingPageBreaks::remove_page_break($dataDir = null, $workbook);
 }