user: Question: Who was the replacement manager for the vacancy of 12 Dec 2009?
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Replaced by', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Shahin Bushehr', 'Hamid Kolali Fard', 'Sacked', '6 Sep 2009', 'Mahmoud Yavari', '8 Sep 2009']
SQL:

assistant: SELECT "Replaced by" FROM "Table" WHERE "Date of vacancy" = '12 Dec 2009';