text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_21312959_1 (written_by VARCHAR, no_in_series VARCHAR)
  ### Question:
  Who are the writers for the episode number in series 129?
  ### Answer:
  SELECT written_by FROM table_21312959_1 WHERE no_in_series = 129