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 | Replaced by | Date of appointment | Position in table |
| --- | --- | --- | --- | --- | --- | --- |
| Crystal Palace | Peter Taylor | Contract terminated | 8 October 2007 | Neil Warnock | 11 October 2007 | 19th |
| Leicester City | Martin Allen | Mutual consent | 29 August 2007 | Gary Megson | 13 September 2007 | 9th |
| Queens Park Rangers | John Gregory | Contract terminated | 1 October 2007 | Luigi De Canio | 29 October 2007 | 24th |
| Norwich City | Peter Grant | Mutual consent | 8 October 2007 | Glenn Roeder | 30 October 2007 | 22nd |
| Leicester City | Gary Megson | Mutual consent (hired by Bolton Wanderers) | 24 October 2007 | Ian Holloway | 22 November 2007 | 19th |
| Burnley | Steve Cotterill | Mutual consent | 8 November 2007 | Owen Coyle | 22 November 2007 | 15th |
| Preston North End | Paul Simpson | Contract terminated | 13 November 2007 | Alan Irvine | 20 November 2007 | 21st |
| Plymouth Argyle | Ian Holloway | Resigned (hired by Leicester City) | 21 November 2007 | Paul Sturrock | 27 November 2007 | 7th |
| Coventry City | Iain Dowie | Contract terminated | 11 February 2008 | Chris Coleman | 19 February 2008 | 19th |
| Sheffield United | Bryan Robson | Mutual consent | 14 February 2008 | Kevin Blackwell | 14 February 2008 | 16th |
| Queens Park Rangers | Luigi De Canio | Mutual consent | 8 May 2008 | Iain Dowie | 14 May 2008 | 14th |
Question:
what are the number of times the date of vacancy was in october?
Answer:
4