text: import string
  letters = list(list(string.ascii_lowercase))
  # http://www.medicinenet.com/symptoms_and_signs/alpha_e.htm
  
  # generating url links on disease list
  def url_links(max_page = 25):
      #file name
      first_extraction = open("first_url_list.txt","w+")
      first_page = 0
  #looping on letters to derived specified url
      print("List of alpha links")
      url_list = list()
      while first_page <= max_page:
          url = "http://www.medicinenet.com/symptoms_and_signs/alpha_" + letters[first_page] +".htm"
          url_list.append(url)
          #saving to file
          first_extraction.write(url + "\n")
  
          print(url)
          first_page +=1
      # returnning a list of uls for further use
      first_extraction.close()
      return url_list