public function getRedoValues()
    {
        static $data;

        if (! $data) {
            $data = array(
                self::REDO_NONE => $this->_('No'),
                self::REDO_ONLY => $this->_('Yes (forget answers)'),
                self::REDO_COPY => $this->_('Yes (keep answers)'));
        }

        return $data;
    }