user: Question: What is the series sorted value for the episode released December 2009?
Columns: ['Series Sorted', 'Title', 'Doctor', 'Featuring', 'Released']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['6Y/AA', 'The Nightmare Fair', '6th', 'Peri , Celestial Toymaker', 'November 2009']
SQL:

assistant: SELECT "Series Sorted" FROM "Table" WHERE "Released" = 'December 2009';