human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Team, Outgoing manager, Manner of departure, Date of vacancy, Replaced by, Date of appointment, Position in table
###Question: What was the manner of departure for the appointment date of 21 september 2010
gpt
SELECT Manner of departure FROM table WHERE Date of appointment = 21 September 2010