new_contents: def url_exists(target, source=None):
      return False
  
  def title_exists(target, source=None):
      return False
  
  def ip_exists(target, source=None):
      return False
  
  def domain_exists(target, source=None):
      return False
  
  def email_exists(target, source=None):
      return False
  
  def cellphone_exists(target, source=None):
      return False
  
  def telephone_exists(target, source=None):
      return False
  
  
subject: add exists.py