Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| series number | number of episodes | original air date | dvd region 2 release date | dvd region 1 release date |
| 1 | 6 | 1973 | 2 september 2002 | tba |
| 2 | 7 | 1975 | 2 september 2002 | tba |
| 3 | 7 | 1976 | 26 july 2004 | 11 march 2008 |
| 4 | 7 | 1977 | 26 july 2004 | 9 september 2008 |
| 5 | 7 | 1979 | 5 march 2007 | 6 september 2009 |
| 6 | 7 | 1982 | 5 march 2007 | 27 april 2010 |
| 7 | 6 | 1983 | 3 march 2008 | 27 april 2010 |
| 8 | 6 | 1985 | 3 march 2008 | 9 july 2010 |
| 9 | 12 | 1987 | 5 may 2008 | 18 january 2011 |
| 10 | 6 | 1988 | 22 september 2008 | 12 april 2011 |
| 11 | 7 | 1989 | 22 september 2008 | 12 april 2011 |
| 12 | 10 | 1990 | 26 december 2008 | 12 july 2011 |
| 13 | 6 | 1991 | 26 december 2008 | 21 february 2012 |
| 14 | 9 | 1992 | 26 october 2009 | 17 april 2012 |
| 15 | 9 | 1993 | 26 october 2009 | 24 july 2012 |
| 16 | 8 | 1995 | 27 december 2010 | tba |
| 17 | 10 | 1995 | 27 december 2010 | 15 june 2004 |
| 18 | 10 | 1997 | 7 february 2011 | 15 january 2013 |
| 19 | 10 | 1998 | 7 february 2011 | 16 april 2013 |
| 20 | 10 | 1999 | 26 march 2012 | 9 july 2013 |
| 21 | 10 | 2000 | 26 march 2012 | 15 october 2013 |
| 22 | 10 | 2001 | 23 april 2012 | 14 january 2014 |
| 23 | 10 | 2002 | 23 april 2012 | tba |
| 24 | 10 | 2003 | tba | tba |
| 25 | 10 | 2004 | tba | tba |
| 26 | 10 | 2005 | tba | tba |
| 27 | 9 | 2006 | tba | tba |
| 28 | 10 | 2007 | tba | tba |
| 29 | 11 | 2008 | tba | tba |
| 30 | 10 | 2009 | tba | tba |
| 31 | 6 | 2010 | tba | tba |
Title:
none
Statement:
the sum of the number of episodes that originally aired before 1991 with a series number smaller than 21 and a dvd region 2 release date of 26 march 2012 is 10.0
Answer:
refuted