What is the 2006 value of the 2009 A value, 2011 A value, and A as the 2007 value?
CREATE TABLE "grand_slam_singles_performance_timeline" (
  "tournament" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "2011" text,
  "2012" text
);
SELECT "2006" FROM "grand_slam_singles_performance_timeline" WHERE "2009"='a' AND "2011"='a' AND "2007"='a';