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_56 (year INTEGER, role VARCHAR, director VARCHAR)
  ### Question:
  What year was the role nan taylor, alias of nan ellis, aka mrs. andrews and directed by William keighley?
  ### Answer:
  SELECT SUM(year) FROM table_name_56 WHERE role = "nan taylor, alias of nan ellis, aka mrs. andrews" AND director = "william keighley"