/**
* Searches the current address book for duplicate entries.
*
* Duplicates are determined by comparing email and name or last name and
* first name values.
*
* @return array A hash with the following format:
* <code>
* array('name' => array('John Doe' => Turba_List, ...), ...)
* </code>
* @throws Turba_Exception
*/
public function searchDuplicates()
{
return $this->_driver->searchDuplicates();
}