CREATE TABLE table_11713303_2 (date_of_vacancy VARCHAR(255), date_of_appointment VARCHAR(255), manner_of_departure VARCHAR(255))
What is the date of vacancy for 10 december 2007 when quit?
    
SQL: SELECT date_of_vacancy FROM table_11713303_2 WHERE date_of_appointment = "10 December 2007" AND manner_of_departure = "Quit"