public function getAllNestedFlat(array $aData = [], $sSeparator = ' &rsaquo; ', $bIncludeDeleted = false)
    {
        $aAllNested = $this->getAllNested($aData, $bIncludeDeleted, 'children');
        $aFlattened = $this->flattenItems($aAllNested);

        foreach ($aFlattened as &$aLabels) {
            $aLabels = implode($sSeparator, $aLabels);
        }

        return $aFlattened;
    }