#6 RA2 YR, June 2010 #2 RA2 YR, February 2008 #2 RA2 YR, January 2008 #8 RA2 YR, August 2007 #1 RA2 YR, July 2007 #4 RA2 YR, June 2007 #6 RA2 YR, May 2007 #4 RA2 YR, April 2007 #6 RA2 YR, February 2007
Hint: Place refineries as close to ore as possible.