what are all the seasons?
2001/02, 2002/03, 2003/04, 2004/05, 2005/06, 2006/07, 2007/08, 2008/09, 2009/10, 2010/11, 2011/12, 2012/13, 2013/14
what were their levels?
4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 6, 6
along with 2012/13, which other season was level 6?
2013/14