private function getReservedTitle($contentTypeName)
    {
        $defaultTitles = $this->defaultTitles->get($contentTypeName);
        $title = array_shift($defaultTitles);
        $existing = $this->repository->findOneBy(['title' => $title]);

        if ($existing || $title === null) {
            $title = trim(strip_tags($this->apiClient->get('/1/veryshort')));
        }
        $this->defaultTitles->set($contentTypeName, $defaultTitles);

        return $title;
    }