Where did the team of Rahal Letterman in 2006 start?
CREATE TABLE "indianapolis_500" (
  "year" real,
  "chassis" text,
  "engine" text,
  "start" real,
  "finish" real,
  "team" text
);
SELECT COUNT("start") FROM "indianapolis_500" WHERE "team"='rahal letterman' AND "year"=2006;