code: def parse_for_simple_stems(output, skip_empty=False, skip_same_stems=True):
      
      lines_with_stems = _get_lines_with_stems(output)
      stems = list()
  
      last_word = None
      for line in lines_with_stems:
          word, stem, _ = line.split("\t")
          stem = stem if stem != '-' else None
  
          if skip_empty and (stem is None):
              continue
  
          if last_word != word:
              stems.append((word, []))
  
          ## append new stem only if not on list already
          stem = None if skip_same_stems and stem in stems[-1][1] else stem
          if stem is not None:
              stems[-1][1].append(stem)
  
          last_word = word
  
      return stems
docs: Parses the output stem lines to produce a list with possible stems
      for each word in the output.
  
      :param skip_empty: set True to skip lines without stems (default is False)
      :returns: a list of tuples, each containing an original text word and
                a list of stems for the given word