code: def get_tokens(max_value):
    
    vocab = [str(i) for i in range(max_value)]
    vocab = set(vocab)
    vocab.update(CodeOp.LITERALS)
    vocab.update(CodeOp.KEYWORDS)
    vocab |= set("".join(vocab))
    return sorted(vocab)
docs: Defines tokens.
  
    Args:
      max_value: the maximum numeric range for the token.
  
    Returns:
      list of string tokens in vocabulary.