Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Team | Outgoing manager | Manner of departure | Date of vacancy | Position in table | Incoming manager | Date of appointment |
| --- | --- | --- | --- | --- | --- | --- |
| Crystal Palace | Paul Hart | Contract expired | 2 May 2010 | Pre-season | George Burley | 17 June 2010 |
| Coventry City | Chris Coleman | Sacked | 4 May 2010 | Pre-season | Aidy Boothroyd | 20 May 2010 |
| Hull City | Iain Dowie | Contract expired | 9 May 2010 | Pre-season | Nigel Pearson | 29 June 2010 |
| Portsmouth | Avram Grant | Resigned | 20 May 2010 | Pre-season | Steve Cotterill | 18 June 2010 |
| Leicester City | Nigel Pearson | Signed by Hull City | 29 June 2010 | Pre-season | Paulo Sousa | 7 July 2010 |
| Swansea City | Paulo Sousa | Signed by Leicester City | 5 July 2010 | Pre-season | Brendan Rodgers | 16 July 2010 |
| Bristol City | Steve Coppell | Resigned | 12 August 2010 | 23rd | Keith Millen | 12 August 2010 |
| Sheffield United | Kevin Blackwell | Mutual consent | 14 August 2010 | 21st | Gary Speed | 17 August 2010 |
| Scunthorpe United | Nigel Adkins | Signed By Southampton | 12 September 2010 | 15th | Ian Baraclough | 24 September 2010 |
| Leicester City | Paulo Sousa | Sacked | 1 October 2010 | 24th | Sven-Göran Eriksson | 3 October 2010 |
| Middlesbrough | Gordon Strachan | Resigned | 18 October 2010 | 20th | Tony Mowbray | 26 October 2010 |
| Sheffield United | Gary Speed | Signed by Wales | 14 December 2010 | 20th | Micky Adams | 30 December 2010 |
| Burnley | Brian Laws | Sacked | 29 December 2010 | 9th | Eddie Howe | 14 January 2011 |
| Preston North End | Darren Ferguson | Sacked | 29 December 2010 | 24th | Phil Brown | 6 January 2011 |
| Crystal Palace | George Burley | Sacked | 1 January 2011 | 23rd | Dougie Freedman | 12 January 2011 |
| Ipswich Town | Roy Keane | Sacked | 7 January 2011 | 19th | Paul Jewell | 10 January 2011 |
| Coventry City | Aidy Boothroyd | Sacked | 14 March 2011 | 19th | Andy Thorn | 28 April 2011 |
Question:
What was the manner of departure for the team whose incoming manager was George Burley?
Answer:
Contract expired