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_20 (time VARCHAR, rider VARCHAR, grid VARCHAR, laps VARCHAR, manufacturer VARCHAR)
  ### Question:
  what is the time when laps is less than 21, manufacturer is aprilia, grid is less than 17 and the rider is thomas luthi?
  ### Answer:
  SELECT time FROM table_name_20 WHERE laps < 21 AND manufacturer = "aprilia" AND grid < 17 AND rider = "thomas luthi"