code: def extract(self, item, list_article_candidate):
          
          list_title = []
  
          # Save every title from the candidates in list_title.
          for article_candidate in list_article_candidate:
              if article_candidate.title is not None:
                  list_title.append(article_candidate.title)
  
          if not list_title:
              return None
  
          # Creates a list with matched titles
          list_title_matches = self.find_matches(list_title)
          # Extract title with the most matches
          matched_title = self.extract_match(list_title_matches)
  
          # Returns the matched title if there is one, else returns the shortest title
          if matched_title:
              return matched_title
          else:
              if list_title_matches:
                  return self.choose_shortest_title(set(list_title_matches))
              else:
                  return self.choose_shortest_title(list_title)
docs: Compares the extracted titles.
  
          :param item: The corresponding NewscrawlerItem
          :param list_article_candidate: A list, the list of ArticleCandidate-Objects which have been extracted
          :return: A string, the most likely title