code: def unique(text):
      
  
      # check if the text is correct
      correct, error = _is_correct(text)
      if not correct:
          raise Exception(error)
  
      s = []
      _all_unique_texts(text, s)
      return s[0]
docs: Return an unique text
  
      @type text: str
      @param text: Text written used spin syntax.
      @return: An unique text
  
      # Generate an unique sentence
      >>> unique('The {quick|fast} {brown|gray|red} fox jumped over the lazy dog.')
      'The quick red fox jumped over the lazy dog'