code: def image_urls(self):
          
  
          all_image_urls = self.finder_image_urls[:]
          for image_url in self.extender_image_urls:
              if image_url not in all_image_urls:
                  all_image_urls.append(image_url)
  
          return all_image_urls
docs: Combine finder_image_urls and extender_image_urls,
          remove duplicate but keep order