Table:
text: So You Think
Race record
2010-11 Season as a Four Year Old
Result_ Date_ Race Venue Group_ Distance Weight_kg Jockey Winner_2nd
Won 28 Aug 2010 Memsie Stakes Caulfield G2 1400 m 58.5 S. Arnold 2nd - Whobegotyou
Won 18 Sep 2010 Underwood Stakes Caulfield G1 1800 m 58 S. Arnold 2nd - Dariana
Won 9 Oct 2010 Yalumba Stakes Caulfield G1 2000 m 58 S. Arnold 2nd - Alcopop
Won 23 Oct 2010 Cox Plate Moonee Valley G1 2040 m 57.5 S. Arnold 2nd - Zipping
Won 30 Oct 2010 Mackinnon Stakes Flemington G1 2000 m 58 S. Arnold 2nd - Descarado

Question: According to So You Think, 2010-11 season as a four year old, how many venues did the MacKinnon Stakes races take place in?