Table:
text: Mersin Büyükşehir Belediyesi S.K.
Season by season
Season by season
Season Tier League Pos_ Turkish_Cup
2004–05 2 TB2L 3 –
2005–06 1 TBL 14 Quarterfinalist
2006–07 1 TBL 9 Group Stage
2007–08 1 TBL 10 Group Stage
2008–09 1 TBL 7 Group stage
2009–10 1 TBL 12 Runner-up
2010–11 1 TBL 13 Group Stage
2011–12 1 TBL 10 Group Stage
2012–13 1 TBL 12 Group Stage

Question: What is the lowest tier for a place under 7 in the group stage of the Turkish Cup under Mersin Büyükşehir Belediyesi SK?