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_name_86 (format VARCHAR, region_4 VARCHAR, _number_episodes VARCHAR, _number_disc_s_ VARCHAR)
  ### Question:
  What was the format for the 4 disc season that had less than 22 episodes and n/a for region 4?
  ### Answer:
  SELECT format FROM table_name_86 WHERE _number_episodes < 22 AND _number_disc_s_ = 4 AND region_4 = "n/a"