What is the date of vacancy for 10 december 2007 when quit?
create table table_11713303_2 (date_of_vacancy varchar, date_of_appointment varchar, manner_of_departure varchar, PRIMARY KEY (date_of_vacancy))
select date_of_vacancy from table_11713303_2 where date_of_appointment = "10 december 2007" and manner_of_departure = "quit"