code: def read_sentences(filename):
      """
      Read the sentences (without tags) from a BIO file
      """
      sentences = []
      with open(filename) as fin:
          lines = fin.readlines()
      current_sentence = []
      for line in lines:
          line = line.strip()
          if not line:
              if current_sentence:
                  sentences.append(tuple(current_sentence))
              current_sentence = []
              continue
          word = line.split("\t")[0]
          current_sentence.append(word)
      if len(current_sentence) > 0:
          sentences.append(tuple(current_sentence))
      return sentences
  
label_desc: Use image node_id 1 for calling a global function with example usage: read_sentences(filename) and returns: sentences