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_22 (launched VARCHAR, commissioned VARCHAR, bow_number VARCHAR)
  ### Question:
  When did the ship that was commissioned July 1948 with a bow number of ps-31 launch?
  ### Answer:
  SELECT launched FROM table_name_22 WHERE commissioned = "july 1948" AND bow_number = "ps-31"