How to use the duden.common.recursively_extract function in duden

def synonyms(self):
        """
        Return the structure with word synonyms
        """
        try:
            section = self.soup.find('div', id='synonyme')
            section = copy.copy(section)
            if section.header:
                section.header.extract()
            return recursively_extract(section, maxdepth=2,
                                       exfun=lambda x: x.text.strip())
        except AttributeError:
            return None

# 1. remove examples
        for dl_node in section.find_all('dl', class_='note'):
            if True or dl_node.dt.text == 'Beispiele':
                dl_node.extract()

        # 2. remove grammar parts
        for dl_node in section.find_all('dl', class_='tuple'):
            if dl_node.dt.text in ['Grammatik', 'Gebrauch']:
                dl_node.extract()

        # 3. remove pictures
        for node in section.find_all('figure'):
            node.extract()

        return recursively_extract(
            section, maxdepth=2, exfun=lambda x: x.text.strip())