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:
| DVD Title | No. of Discs | Year | No. of Episodes | Region 1 | Region 2 | Region 4 |
| --- | --- | --- | --- | --- | --- | --- |
| Series 1 | 4.0 | 1978 | 13.0 | 14 May 2002 | N/A | 2 January 2013 |
| Series 1, Volume 1 | 3.0 | 1978 | 6.0 | N/A | 7 April 2003 | 1 September 2003 |
| Series 1, Volume 2 | 3.0 | 1978 | 7.0 | N/A | 5 May 2003 | 1 September 2003 |
| Series 1 & 2 | 8.0 | 1978 | 27.0 | N/A | N/A | 5 October 2010 |
| Series 2 | 4.0 | 1978 | 14.0 | 15 October 2002 | N/A | 2 January 2013 |
| Series 2, Volume 1 | 3.0 | 1978 | 7.0 | N/A | 7 July 2003 | 5 May 2005 |
| Series 2, Volume 2 | 3.0 | 1978 | 7.0 | N/A | 15 September 2003 | 5 May 2005 |
| Series 3 | 4.0 | 1979–1980 | 14.0 | 16 September 2003 | 23 October 2006 | 4 May 2006 |
| Series 4 | 3.0 | 1988 | 10.0 | 14 September 2004 | 26 December 2006 | 11 April 2007 |
| Series 5 | 4.0 | 1988 | 12.0 | 19 July 2005 | 3 March 2008 | 2 April 2008 |
| Series 6 | 4.0 | 1989 | 12.0 | 25 July 2006 | 18 August 2008 | 2 April 2009 |
| Series 7 | 4.0 | 1990 | 13.0 | 14 August 2007 | 26 December 2008 | 18 May 2010 |
| Christmas Specials | 2.0 | 1983 and 1985 | 2.0 | 16 September 2003 | 20 October 2008 | 2 April 2008 |
Question:
What is the largest number of episodes for a 1989 season dvd release? 
Answer:
12.0